Air is a mixture of several gases. The 10 most abundant of these gases in dry ai

Question

Air is a mixture of several gases. The 10 most abundant of these gases in dry air are listed here along with their mole fractions and molar masses.

Part A

What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 13?C and a pressure of 663torr ?

Express your answer numerically in grams.

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Part B

Calculate the mass percentage of oxygen in dry air.

Express the mass percentage using three significant figures.

0.677

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Component Mole fraction Molar mass
(g/mol) Nitrogen 0.78084 28.013 Oxygen 0.20948 31.998 Argon 0.00934 39.948 Carbon dioxide 0.000375 44.0099 Neon 0.00001818 20.183 Helium 0.00000524 4.003 Methane 0.000002 16.043 Krypton 0.00000114 83.80 Hydrogen 0.0000005 2.0159 Nitrous oxide 0.0000005 44.0128 Air is a mixture of several gases. The 10 most abundant of these gases in dry air are listed here along with their mole fractions and molar masses. Component Mole fraction Molar mass (g/mol) Nitrogen 0.78084 28.013 Oxygen 0.20948 31.998 Argon 0.00934 39.948 Carbon dioxide 0.000375 44.0099 Neon 0.00001818 20.183 Helium 0.00000524 4.003 Methane 0.000002 16.043 Krypton 0.00000114 83.80 Hydrogen 0.0000005 2.0159 Nitrous oxide 0.0000005 44.0128 Part A What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 13?C and a pressure of 663torr ? Express your answer numerically in grams. g Part B Calculate the mass percentage of oxygen in dry air. Express the mass percentage using three significant figures. 0.677 %

Explanation / Answer

Part a

PV = nRT

n =PV/RT

n = 663/760 x 1/ 0.082 x 286

n = 0.872/23.45 = 0.037 moles

o.037 moles of CO2

mass of CO2 = no of moles of CO2 x molecular mass = 1.628g

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