Question

How many grams of ethane gas (C2H6) are in a 12.7 liter sample at 1.6 atmospheres and 24°C? Show all work used to solve this problem.

Answer 1

Use ideal gas law
PV=nRT

Answer 2

Find the moles first,
\[n=\frac{PV}{RT}\]
\[\Huge n=\frac{(1.6~atm)(12.7~L)}{(0.082\frac{atmL}{molK})(297.2K)}\]
n=0.83mol
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\[0.83~mol C_2H_{6} \times \frac{30~gC_2H_6}{1~molC_2H_6}=24.9gC_2H_6\]