Question

An empty $LPG$ cylinder weighs $14.8kg$. When full, it weighs $29.0kg$ and shows a pressure of $3.47atm$. In the course use at ambient temperature, the mass of the cylinder is reduced to $23.0kg$. The final pressure inside the cylinder is____$atm$.
(Nearest Integer)
(Assume $LPG$ to be an ideal gas)

Answer 1

Initial amount of gas present in the cylinder
$(29.0-14.6)$
$=14.2kg$
Final amount of gas present in the cylinder
$(23.0-14.8)$
$=8.2kg$
$\frac{P_1}{n_1}=\frac{P_2}{n_2}$
$P_2=n_2\times \frac{P_1}{n_1}=\frac{8200}{MM}\times \frac{3.47\times MM}{14200}$
$P_2=2atm$