Question

A $10.0 \,L$ flask contains $64\, g$ of oxygen at $27^{\circ} C$. (Assume $O _{2}$ gas is behaving ideally). The pressure inside the flask in bar is (Given $R =0.0831 \,L\, bar\, K ^{-1} mol ^{-1}$ )

• A. $4.9$
• B. $2.5$
• C. $498.6$
• D. $49.8$

Answer 1

Answer: (A)

$V =10 L $
$ W _{ O _{2}}=64 \,g$
$T =2{ }^{\circ} C$
$ n _{ O _{2}}=2$
$R =0.083 . L$ bar $K ^{-1} \,mol ^{-1}$
Ideal gas equation $PV = nRT$
$P =\frac{2 \times 0.0831 \times 300}{10}$
$P =4.9$ bar