Question

Convert 10 kg-moles of propane to (a) lb-mole propane, (b) kg-moles C, (c) kg-mole H2, (d) kg C, (e) kg H2, and (f) molecules of propane.

Answer 1

Molecular formula for propane = C3H8

a) 1 kg = 2.203 lb

Therefore, 10 kg-moles propane = 10 * 2.203 lb-mol propane = 22.03 lb-mol propane

b) 1 kg-mol propane 3 kg-mole C

c) 1 kg-mol propane 4 kg-mole H2

d) 3 kg-mole C = 3 kg-mole C x 12 kg / kg-mole = 36 kg C..............multiplied by molecular weight

e) 4 kg-mole H2 = 4 kg-mole H2 x 2 kg / kg-mole = 8 kg C

f) 1 mole = 6.023 x 10²³ molecules or atoms ...........Avagadro's number

.: 3 kg-mole propane = 3 x 1000 moles x 6.023 x 10²³ molecules / moles = 1.8069 x 10²⁷ molecules of propane