Consider a gaseous mixture consisting of 5 kmol of H2 and 3 kmol of O2. Determine the H2 and O2 mole fractions, the molecular weight of the mixture, and the H2 and O2 mass fractions
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Ответ:
Mole fraction H2: 0.625
Mole fraction O2: 0.375
Molecular weight: 13.25g/mol
Mass fraction H2: 0.094
Mass fraction O2: 0.906
Explanation:
Moles fraction is defined as the ratio between moles of a substance and total moles presents in a mixture:
Mole fraction H2 = 5kmol / (5kmol + 3kmol) = 0.625
Mole fraction O2 = 3kmol / (5kmol + 3kmol) = 0.375
Molecular weight is defined as the mass per mole of substance:
Mass H2 = 5kmol * (2kg / kmol) = 10kg
Mass O2 = 3kmol * (32kg / kmol) = 96kg
Molecular weight:
106kg / 8kmol = 13.25g/mol
In the same way, mass fraction is the ratio between mass of a substance and total mass of the mixture:
Mass fraction H2 = 10kg / (10kg + 96kg) = 0.094
Mass fraction O2 = 96kg / (10kg + 96kg) = 0.906
Ответ: