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Compositions

# Compositions - Compositions of Mixtures 1 Composition...

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1 Compositions of Mixtures

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2 Composition Definition Concentration of each component in the mixture Units Mole fractions Mole % Mass fractions (Weight fraction) Mass % (Weight %)
3 Example 1 A mixture contains 20 lb moles of Ethane 30 lb moles of n-Heptane Determine the total composition of the mixture in mole fractions 1 2 20/ 50 0.4000 30/ 50 0.6000 E H z z z z z = = = =

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4 Example 2 Express the composition of the mixture of Example 1 in mole % Solution 1 2 0.40*100 40.00 0.60*100 60.00 E H z z z z z = = = =
5 Example 3 A mixture contains 600 lb mass of Ethane 3000 lb mass of n-Heptane Determine the total composition of the mixture in mole fractions

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6 Example 3 - Solution Using the molecular weight (molar mass), convert lb mass to lb moles for each component 600/30 = 20 lb moles of Ethane 3000/100 = 30 lb moles of n-Heptane mass moles = molecular weight
7 Example 3 - Solution Determine the total composition of the mixture in mole fractions as before 1 2 20/ 50 0.4000 30/ 50 0.6000 E H z z z z z = = = =

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8 Molecular Wt (Molar Mass) Carbon Atomic weight (Mass number) = 12 Hydrogen Atomic weight (Mass number) = 1 Ethane – Formula: C 2 H 6 – M E = 2*12 + 6*1 = 30 lb mass/lb mole Heptane – Formula: C 7 H 16 – M H = 16*12 + 16*1 = 100 lb mass/lb mole
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Compositions - Compositions of Mixtures 1 Composition...

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