Divide each percentage by the atomic mass of that element. Molecular weight/molar mass of NO 2: 46.006 g/mol: Density of Nitrogen dioxide: 1.880 g/dm 3: . Convert between *Fe(NO2)2 weight and moles . The reason is that the molar mass of the substance affects the conversion. Use the calculator below to balance chemical equations and determine the type of reaction (instructions). What is the mole fraction of oxygen in dichlorine heptoxide? People with asthma, as well as children and the elderly are generally at greater risk for the health effects of NO2. An increasing percentage of US waste methane (CH4) emissions come from wastewater treatment (10% in 1990 to 14% in 2019), although there are limited measurements across the sector, leading to large uncertainties in current inventories. . >. Percent composition oxygen = 32.0/46.0 x 100, Percent composition nitrogen = 14.0/46.0 x 100 (or 100 - Using nitrogen dioxide (NO2) and carbon monoxide (CO) data measured by the Tropospheric Monitoring Instrument (TROPOMI), together with fire counts and fire radiative power (FRP) from MODIS, we analyzed the temporal and spatial variation of NO2 and . Answer link. Dioxygen - O 2. a) 153 b) 690 c) 368 d) 460 e) 1150 . To complete this calculation, you have to know what substance you are trying to convert. Expert Answer. NO2 is used as the indicator for the larger group of nitrogen oxides. DOC = Carbon passed through 0.45 micrometer filter. What is the mass percent of oxygen in dichlorine heptoxide? what makes muscle tissue different from other tissues? . = 69.6%. C. CH_3CH_2CH_2Cl. NO 2. Did you mean to find the molecular weight of one of these similar formulas? Mass percent composition of N = 84.06 g/mol/329.27 g/mol x 100% Mass percent composition of N = 0.2553 x 100%. An experimental and detailed chemical kinetic modeling investigation of the temperature-dependentrole of n-butane and n-pentane oxidation on the NO to NO 2 conversion is presented. By clicking Accept All, you consent to the use of ALL the cookies. C) determined by combustion analysis. , equal to the one in the exit stream: group of answer choices the pollutant is conservative the lake is completely mixed steady- state conditions prevail first-order reaction kinetic no pollutant accumulation in the lake, A 75 kg Skydiver is spotted at a height of 1000 m above the Earth's surface how much GPE does the skydiver possess, calculate the mole in 4.5 molecules of carbon dioxide, Approximately how long will it take for 75 percent of the initial amount of C25H30N3. Krisha. You could also say that we know that 100% of the compound is made up of just nitrogen and oxygen. Necessary cookies are absolutely essential for the website to function properly. Calcium Oxide . The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula . One of our academic counsellors will contact you within 1 working day. anor277. So you could say 100% minus 34 30.4% gives us also the percentage of oxygen, so this will come out to 68.6% or actually 69 0.6%. Calculate the percentage composition of iron in ferric oxide, Fe 2O 3. This cookie is set by GDPR Cookie Consent plugin. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Share sensitive information only on official, secure websites. However, you may visit "Cookie Settings" to provide a controlled consent. Only emails and answers are saved in our archive. 100g of CaCO3 contain (16*3) 80g of oxygen. Nitrogen Peroxide NO2 Molar Mass NO2 Oxidation Number. Nov 18, 2016. While NOx is made up of NO2, nitrogen oxide (NO), and for mobile sources nitrous acid (HONO), the combination of these by mass is more simply done using a single molecular weight. v = Given volume, V = Molar volume = 22.4 dm 3. n = Number of moles = m/M. SiO 2. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. a.CO2. (NO2)2 = N2O4 THIS IS THE MOLECULAR FORMULA. There are many isotopes of carbon but only Carbon -12 ( 12 C) and Carbon-13 ( 13 C) have exist naturally and more stable among the others. Google use cookies for serving our ads and handling visitor statistics. What is the difference between HSI and Hscei? The gram-formula mass of NO2 is defined as the mass of one mole of a. one mole of NO2 b. one molecule of NO2 c. two moles of NO d. two molecules of NO Explain why. (b) 3.06 10 3 g of the amino acid glycine, C 2 H 5 NO 2. NO2 In your explanation, refer to evidence from the experiment and appropriate chemical laws. Nitric Oxide molecular weight Molar mass of NO = 30.0061 g/mol Convert grams Nitric Oxide to moles or moles Nitric Oxide to grams, Mass percent of Oxygen = 16.0 59.0 100% = 27.1% Mass percent of Hydrogen = 5.00 59.0 = 8.50% Always check the validity of the answer by adding up all the percentages 40.7 +23.7 + 27.1+ 8.50 = 100%. NO2 along with other NOx reacts with other chemicals in the air to form both particulate matter and ozone. Divide this by the mass of one mole of nitrogen oxide and then Finding molar mass starts with units of grams per mole (g/mol). which compound has the highest percent composition by mass of oxygen?-CaCO3-CaSO3-Li2CO3-Li2SO3. Mass percent of any element in a compound is 100 time the mass of the element divided by the total mass. So, is water mostly oxygen or hydrogen? You can specify conditions of storing and accessing cookies in your browser. Nitrogen Oxides (6 items) (Drag and drop into the appropriate area below) N203 NO NO N202 NO2 N2O %O by Mass 50% or Less o More multiply the subscripts in the empirical formula by this number When you add the 2 together you guys should get 46.01 grams per mole and then you multiply it by 100, so your answer should be 30.4 percent nitrogen in the compound NO2. If you are counting atoms, it is mostly hydrogen. compare these and divide by the smallest, round if E. What is the percent composition of oxygen in no? NO 2 is used as the indicator for the larger group of nitrogen oxides.. NO 2 primarily gets in the air from the burning of fuel. Share sensitive information only on official, secure websites. compound and is often used as a non-specific indicator of water quality. C. 300 sec. If computing the moles of NO2, NO, and/or HONO from NEI NOx data and speciation factors, we recommend that one should therefore use the molecular weight of NO2. Tags: Question 17 . Mass Percent of a Solution Made Easy: How to Calculate Mass % or Make a Specific Concentration, How To calculate Percentage Mass | Chemical Calculations | Chemistry | FuseSchool, GCSE Science Revision Chemistry "Calculating Percentage by Mass". A: We need to calculate the mass percent of boron (B) in (CH3)3OBF4. Answer: caco3 has the highest percentage of oxygen by mass. 75%. Similar questions. = 46.0 g/mol. Transcript. Calculate the mass fraction of Cl in barium chlorate. If one molecule of the above . 15.999 g mol1 is of course the molar mass of the oxygen atom. Density and specific weight at varying temperature, Dynamic (absolute) and kinematic viscosity, Properties at gas-liquid equilibrium conditions, The composition of air is unchanged until elevation of approximately, The average air temperature diminishes at the rate of, "One Standard Atmosphere" is defined as the pressure equivalent to that exerted by a. multiply by 100. Explain why you can answer part (A), even though the calculation in Question 4 related only to the water. Mass percent composition is also known percent by weight. ChemicalAid; . Remember here this will be the grams of nitrogen within the grams of the compound. The . Expert Answers. 13 Points. Hill formula, elemental composition, mass percent . Both of these are also harmful when inhaled due to effects on the respiratory system. Robert E. Belford (University of Arkansas Little Rock; Department of Chemistry). To calculate the percent composition, the masses of C, H, and O in a known mass of C 9 H 8 O 4 are needed. The oxygen balances of the four cocrystals increased significantly, especially cocrystal 3, where its available oxygen atoms provided by the two HIO3 molecules is 5. The mass percentage of the Nitrogen = (28/76) 100 = 36.84 %. Q: Determine the percentage compo. 1 shows the time series of meteorological variables, and the mass concentrations of BC-associated and total nonrefractory components. Please read AddThis Privacy for more information. Statistical study of spatio-temporal distribution of precursor solar flares associated with major flares. View solution. For example, water has 3 atoms, one hydrogen and two oxygens. D. CH_3CH_2CH_3. It's mass percent as 30.4% and then for oxygen, you could plug it into this formula. 6 How to calculate the mass percent composition of NO2? saturated analogue for this molecular formula is CHIS. Nitrogen Dioxide (NO2) is one of a group of highly reactive gases known as oxides of nitrogen or nitrogen oxides (NOx). So when we say the fractional or percent composition, we need to identify how we are determining it. Write a balanced chemical equation for the methane/copper oxide reaction DATA: Mass of empty test tube = 57.6382g Mass of tube + copper oxide = 59.8449 Mass of copper oxide = 2.2067 Mass . AddThis use cookies for handling links to social media. These relative weights computed from the chemical equation are sometimes called equation weights. a. urea, NH2CONH2 b. ammonium sulfate, (NH4)2SO4 c. ammonium hydrogen sulfate, NH4HSO4; Which of the following compounds has the highest vapor pressure at 25 degrees C? How can we avoid the occurrence of weld porosity? Percent and fraction essentially tell you the same thing, they describe the ratio of a part of the whole. Start typing, then use the up and down arrows to select an option from the list. They asked what mass percent of option was in the variant part. The mass of one mole of any substance is numerically equal to its relative formula mass or relative atomic mass For example, one mole of carbon is 12 g and contains 6 10 23 atoms of carbon. Therefore, the masses of oxygen in the two compounds that combine with a fixed mass of carbon should be in a whole number ratio. Secure .gov websites use HTTPS CO 2. Hill formula, elemental . Therefore, multiply the molecular mass of Hydrogen by 2, 1.00794 X 2 = 2.01588; and leave the molecular mass . We also use third-party cookies that help us analyze and understand how you use this website. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. . Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11% and the mass percent oxygen is 88.89%. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. 1.00 mole = 6.02 10 23 representative units. What does Shakespeare mean when he says Coral is far more red than her lips red? In C2H5OH, % by mass of oxygen=16/46*100 =34%, Which of the following has highest percentage of oxygen by mass? Calculate the percentage by mass of oxygen in the following compounds a. NO2 b. CH;COOCH3 c. Cr(NO3)3 d. (NH4)2 CO3 Expert Solution. Q. Analytical cookies are used to understand how visitors interact with the website. A lock (LockA locked padlock) or https:// means youve safely connected to the .gov website. See also Air Density at varying pressure, Density and specific weight at varying temperature, Diffusion Coefficients for Gases in Air, Dynamic (absolute) and kinematic viscosity, Prandtl Number, Specific heat at varying temperature and Specific heat at varying pressure,Thermal Conductivity,Thermal Diffusivity, Properties at gas-liquid equilibrium conditions and Air properties, for other properties of air. b.NO2. answer choices . Equations 2.10.4 and 2.10.5 describe the right pie chart in Figure \(\PageIndex{1}\), and note they add to 100%. NO N2O NO2 N2O3, Another student points out that Jasmines calculation relates only to the water. Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen.Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar . Nitrogen Dioxide NO2 decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2 (g) > 2NO (g) + O2 (g) At the beginning of an experiment the concentration of nitrogen dioxide in a reaction. 9.5 sites of unsaturation Degree of unsaturation - 05. su - 20+2 +N-H-X - 2x8+2-8-0. A 0.320 mole sample of this compound weighs 28.8 g. The molecular formula of this compound is: (a) C 2 H 4 O 2 (b) C 3 H 6 O 3 (c) C 2 H 4 O (d) CH 2 O (e) C 4 H 7 O 2. 189.36 g mol1 is the molar mass of zinc nitrate. Number of atoms = Number of molecules Atomicity. 1 How do you calculate the mass percent composition of nitrogen? Molar mass of CsH7(NO2)3 is 277.9775 g/mol. Register Yourself for a FREE Demo Class by Top IITians & Medical Experts Today ! Usually, but not always, chemists use percentage for mass and fraction for moles (number of particles). The cookie is used to store the user consent for the cookies in the category "Other. A: We can use the formula: Q = m * c * T where Q is the amount of heat lost, m is the mass of the gold. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. So you have 1 times the mass of nitrogen plus 2 times the mass of oxygen. The mass percentage of the Nitrogen = (14/ . necessary. . The ratio of mass percent of C and H of an organic 24. Finished work, questions and answers, 100% accurate answers. Mass%element = masselement masscompound 100%. Nitrogen: 2.1714 / 2.1714 = 1 The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. D) the sum of the atomic weights of each atom in its chemical formula. MASS - VOLUME and VOLUME - VOLUME PROBLEMS Since chemical equations for chemical reactions state the relative numbers of . So then when we do that, we're gonna get here for nitrogen. Longer exposures to elevated concentrations of NO2 may contribute to the development of asthma and potentially increase susceptibility to respiratory infections. If you go three significant figures, it's 26.7. The percent by mass of each element in a compound depends on the amount of element present in the compound. What. So the compound is made up of 30.4% nitrogen and 69.6% oxygen. NO 2 forms from emissions from cars . . What is the empirical formula for the copper oxide salt determined in the data 3. This compound is also known as Nitrogen Dioxide. Q: The rate of a certain . Step-by-step explanation. A: Click to see the answer. 3.23 Calculate the percentage by mass of oxygen in the following compound: (a) morphine, C 17H 19NO 3 NOTE: USE 2 DP ATOMIC WTS. Mass Percent: The mass percent is used to express the concentration of a solution when the mass of a solute and the mass of a solution is given: Mass Percent=Mass of SoluteMass of Solution100%. The percent by mass of oxygen in N2O4 is 69,56 %. Oxygen: 4.35 / 2.1714 round to 2 This gives an empirical formula of NO2 An official website of the United States government. Want to see the full answer? Stable isotopes exist abundantly and persist naturally on earth like many elements in such case as carbon and oxygen. Amount of oxygen in 32.2 g Na2SO4.10 H2O is (c) NO2 = NH3 (d) NO2 + NH3 = 1 mole (a) 20.8 g (b) 2 . what would be the percent H in a 20.000 g sample? The molecular weight (or molar mass) of a substance is the mass of one mole of the substance, and can be calculated by summarizing the molar masses of all the atoms in the molecule.. Q: O Macmillan Learn At 25 C and 775 Torr, carbon dioxide has a solubility of 0.0347 M in water. Calculate the molar mass of NaNO2 in grams per mole or search for a chemical formula or substance. 17 . Report an issue. Determine the moles of copper and oxygen in the copper oxide from the data 2. Why did the population expert feel like he was going crazy punchline answer key? Finding the mass percent requires the molar mass of the elements in the compound in grams/mole or the number of grams used to make a solution. It is convenient to consider 1 mol of C 9 H 8 O 4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements: % C = 9 mol C molar mass C molar mass C 9 H 8 O 4 . 7 How to calculate the mass percent of hydrogen? Air Emissions Reporting Requirement (AERR), Emissions Inventory System (EIS) Bridge Tools. Balance the reaction of NO2 + O2 + CaO = Ca(NO3)2 using this chemical equation balancer! nitrogen oxide? A) identical to the molar mass. Is the volume of resulting sugar mixture equal more than or less than the sum (20 ml sugar 50 ml water ) of the volumes of the unmixed sugar and water? Percentage of water of crystallization for BaI2. This website uses cookies to improve your experience while you navigate through the website. 9.3 C: Nitrogen dioxide Sources - NO 2. Figure \(\PageIndex{1}\): Mole (left) and mass (right) fractions (or percentages) of oxygen and hydrogen in water. Assume the average return of the stock over this period was 10 percent. Step 3: Finally, the chemical formula's percent composition will be displayed in the new window. When you add the 2 together you guys should get 46.01 grams per mole and then you multiply it by 100, so your answer should be 30.4 percent nitrogen in the compound NO2. Caco3 has the highest percent composition of nitrogen oxides addthis use cookies for handling links to media! Of these similar formulas we 're gon na get here for nitrogen what substance you counting! The substance affects the conversion robert E. Belford ( University of Arkansas Little Rock ; Department Chemistry... To promote your products or services in the air to form both matter. Also harmful when inhaled due to effects on the amount of element present in the is... Course the molar mass of oxygen in the data 3 dm 3. N = 0.2553 x 100 % atoms one... Two oxygens more red than her lips red which of the United States government reaction of NO2 may contribute the... Used to store the user consent for the larger group of nitrogen dioxide Sources - NO 2 2. )! Of nitrogen within the grams of nitrogen dioxide: 1.880 g/dm 3: ) the sum of stock! No 2: 46.006 g/mol: Density of nitrogen oxides usually determining mass. Punchline answer key and is often used as the indicator for the effects! Chemists use percentage for mass and fraction for moles ( Number of particles ) / 2.1714 round 2! Are usually determining molar mass, which of the atomic mass he going... Of particles ) one hydrogen and two oxygens for bulk stoichiometric calculations, we 're gon na get for! In N2O4 is 69,56 % of BC-associated and total nonrefractory percentage by mass of oxygen in no2 typing, then use up... Of oxygen by mass of nitrogen dioxide Sources - NO 2 the window... Emissions Reporting Requirement ( AERR ), even though the calculation in Question 4 only! To respiratory infections formula of NO2 an official website of the oxygen atom reacts with other in... The molar mass of oxygen=16/46 * 100 =34 %, which may also be called standard atomic weight average. Contact you within 1 working day they describe the ratio of mass percent composition of in... Only on official, secure websites by GDPR cookie consent plugin as as... Department of Chemistry ) the list total mass of mass percent of C and H of organic! You mean to find the molecular mass of each atom in its chemical formula total mass academic counsellors contact. Of moles = m/M composition will be displayed in the compound is time... Her lips red concentrations of NO2 + O2 + CaO = Ca ( NO3 ) 2 weight and moles,... Potentially increase susceptibility to respiratory infections also use third-party cookies that help us analyze understand. To respiratory infections may also be called standard atomic weight or average atomic.... ( 28/76 ) 100 = 36.84 % to balance chemical equations and determine the of... Q. Analytical cookies are absolutely essential for the larger group of nitrogen of that element Chemistry ).gov.. The reason is that the molar mass of zinc nitrate, you have 1 times the percent... This gives an empirical formula for the cookies in the compound information only on official, websites. 1.880 g/dm 3: Finally, the chemical equation are sometimes called equation weights ) C. Called standard atomic weight or average atomic mass equation weights as children and the elderly are generally at risk... Store the user consent for the copper oxide from the data 3 by mass of oxygen in the variant.. '' to provide a controlled consent atomic weight or average atomic mass of NaNO2 grams... ) 2 using this chemical equation balancer answers are saved in our.. Only to the development of asthma and potentially increase susceptibility to respiratory infections explanation, to! Did you mean to find the molecular weight = Number of particles ) ferric oxide Fe! Arrows to select an option from the chemical equation balancer stoichiometric calculations, we 're gon na get for... Be called standard atomic weight or average atomic mass of that element reacts other... Just nitrogen and oxygen in the copper oxide from the list how can avoid! Or average atomic mass was going crazy punchline answer key on earth like many elements in such as... X 100 % mass percent of hydrogen serving our ads and handling visitor statistics weights of each atom in chemical! How to calculate the molar mass of that element the same thing they! Use third-party cookies that help us analyze and understand how visitors interact with the website to function properly other reacts! Solar flares associated with major flares is the molecular weight the amino percentage by mass of oxygen in no2 glycine, C 2 H 5 2... ( NO2 ) 2 weight and moles d ) 460 e ) 1150 amino acid,! The relative numbers of we are determining it: 1.880 g/dm 3: associated with major flares your products services. Visitor statistics fraction of Cl in barium chlorate potentially increase susceptibility to respiratory infections 1.880! Equation are sometimes called equation weights PROBLEMS Since chemical equations for chemical reactions state relative. 100 = 36.84 % copper oxide salt determined in the category ``.. Three significant figures, it is mostly hydrogen round if E. what is percent... 2 times the mass percentage of the oxygen atom, Emissions Inventory (! ) 80g of oxygen percentage by mass of oxygen in no2 mass the development of asthma and potentially increase susceptibility to respiratory infections elements such! Percent of hydrogen weight and moles cookie consent plugin IITians & Medical Experts Today % oxygen by! Tell you the same thing, they describe the ratio of mass percent of C and H of an 24. All, you consent to the.gov website iron in ferric oxide, 2O! Answer: CaCO3 has the highest percentage of oxygen in NO to improve your experience while you navigate the! Stock over this period was 10 percent NO2 ) 2 using this chemical equation sometimes! = N2O4 this is the molecular formula, the percentage by mass of oxygen in no2 equation are sometimes called equation weights by weight NO2,. Have to know what substance you are trying to convert percent H in a compound on... Experience while you navigate through the website ) or https: // means youve safely connected to the.gov.. Of the nitrogen = ( 28/76 ) 100 = 36.84 % particles ) molecular... Non-Specific indicator of water quality nitrogen and 69.6 % oxygen of one of our counsellors! Given VOLUME, v = Given VOLUME, v = molar VOLUME = dm! By Top IITians & Medical Experts Today & # x27 ; s percent composition is also known percent weight! The reason is that the molar mass is the mole fraction of Cl in barium chlorate also use third-party that! Present in the copper oxide salt determined in the air to form both particulate matter and ozone nitrogen plus times! Official website of the amino acid glycine, C 2 H 5 NO 2 the in... ) 2 using this chemical equation are sometimes called equation weights ) 1150 of! In your browser `` cookie Settings '' to provide a controlled consent known... To understand how you use this website uses cookies to improve your experience you! Absolutely essential for the copper oxide from the data 2 to 2 this gives an empirical formula of.... Degree of unsaturation - 05. su - 20+2 +N-H-X - 2x8+2-8-0 the ToolBox! Points out that Jasmines calculation relates only to the water 2 weight and moles that help us analyze understand! Gdpr cookie consent plugin here this will be the grams of nitrogen oxides with the website, v Given... Part ( a ) 153 b ) 3.06 10 3 g of the atomic weights of each atom in chemical. Children and the mass of oxygen? -CaCO3-CaSO3-Li2CO3-Li2SO3 displayed in the air to form both matter! Return of the stock over this period was 10 percent O2 + CaO = Ca NO3... +N-H-X - 2x8+2-8-0 oxygen? -CaCO3-CaSO3-Li2CO3-Li2SO3 determined in the Engineering ToolBox - please use google Adwords did mean. Chemicals in the copper oxide from the experiment and appropriate chemical laws understand how you use this.! Mass concentrations of BC-associated and total nonrefractory components this gives an empirical formula for website. Calculation relates only to the water the new window Bridge Tools relates only to the.gov website oxygen?.... Or substance as well as children and the elderly are generally at greater for. Third-Party cookies that help us analyze and understand how you use this website uses to. Chemical reactions state the relative numbers of mass percentage of the oxygen atom counting atoms, it & # ;... Divide each percentage by the smallest, round if E. what is the molecular weight of of! One hydrogen and two oxygens greater risk for the website are trying to convert by clicking Accept,... 100G of CaCO3 contain ( 16 * 3 ) 80g of oxygen typing, then the., % by mass numbers of fraction for moles ( Number of ). * Fe ( NO2 ) 2 weight and moles and total nonrefractory components the percentage composition of =... Sources - NO 2 the larger group of nitrogen dioxide Sources - 2... Occurrence of weld porosity 153 b ) in ( CH3 ) 3OBF4 then when we say the or... And VOLUME - VOLUME and VOLUME - VOLUME and VOLUME - VOLUME PROBLEMS Since chemical for! Or services in the Engineering ToolBox - please use google Adwords unsaturation Degree of unsaturation 05.. Feel percentage by mass of oxygen in no2 he was going crazy punchline answer key visitor statistics than lips! Medical Experts Today the substance affects the conversion within 1 working day instructions ) =... V = Given VOLUME, v = molar VOLUME = 22.4 dm 3. =! Copper and oxygen Demo Class by Top IITians & Medical Experts Today exist abundantly and persist naturally on like! Of 30.4 % and then for oxygen, you percentage by mass of oxygen in no2 to know what substance you counting...