question_answer 1)

A mixture of hydrogen and oxygen at one bar pressure contains 20% by weight of hydrogen. Calculate the partial pressure of hydrogen.

Answer:

\[{{w}_{{{H}_{2}}}}=20g;\] \[{{w}_{{{O}_{2}}}}=80g\] \[{{n}_{{{H}_{2}}}}=\frac{20}{2}=10;\] \[{{n}_{{{O}_{2}}}}=\frac{80}{32}=2.5\] \[{{x}_{{{H}_{2}}}}=\frac{10}{10+2.5}=0.8;\] \[{{x}_{{{O}_{2}}}}=1-{{x}_{{{H}_{2}}}}=0.2\] \[{{P}_{{{H}_{2}}}}={{x}_{{{H}_{2}}}}\times P\] \[=0.8\times 1=0.8bar\] \[{{P}_{{{O}_{2}}}}=0.2\times 1=0.2bar\]