Amixture of gases is analyzed and found to have the following composition in mol %: co2 12.0 co 6.0 ch4 27.3 h2 9.9 n2 44.8 a) determine the composition of the gas mixture in weight %. b) determine the average molecular weight of the gas mixture.

a) CO₂: 21,9%; CO: 7,0%; CH₄: 18,2%; H₂: 0,8%; N₂: 52,1%

b) 24,09 g/mol

Explanation:

a) It is posible to obtain the composition of the gas mixture in weight% using molecular mass of each compound, thus:

12% CO₂× = 528,1 g

6% CO× = 168,1 g

27,3% CH₄× = 438,2 g

9,9% H₂× = 20,0 g

44,8% N₂× = 1254,4 g

The total mass of the gas mixture is:

528,1g + 168,1g + 438,2g + 20,0g + 1254,4g = 2408,8 g

Thus composition of the gas mixture in weight% is:

CO₂: ×100 = 21,9%

CO: ×100 = 7,0%

CH₄: ×100 = 18,2%

H₂: ×100 = 0,8%

N₂: ×100 = 52,1%

b) The average molecular weight of the gas mixture is determined with mole % composition, thus:

0,12×44,01g/mol + 0,06×28,01g/mol + 0,273×16,05g/mol + 0,099×2,02g/mol + 0,448×28g/mol = 24,09 g/mol

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.