Question #dc3c2

1 Answer
May 6, 2016

First write the balanced oxidation-reduction reaction, then determine the number of moles of iron, then moles of H2, then calculate the volume of gas using the ideal gas law , and finally multiply by 0.75 for the yield. (whew!)

Explanation:

Fe+2H+Fe2++H2

11.2g55.845gmol=0.201 mol Fe = 0.201 mol H2

STP = standard temperature and pressure:
1 atm pressure and 273.15 K

Using the ideal gas law, where R = 0.08206 L-atm/(mol-K):

V=nRTP=0.2010.082062731=4.50L

75% yield gives V=4.50L×0.75=3.38L