Question

A fixed amount of gas expanded from 5 L to 7.5 L at a constant temperature. The initial pressure is 3 atm. Find the final pressure. (in atm)

• A. 2

Answer 1

The correct option is A 2
As the temperature is constant, we will apply Boyle's law, which states that -
$PV$ = constant
Thus, $P_1{V}_1=P_2{V}_2$

where $P_{1}and{V}_1$ are the initial pressure and volume, and $P_{2}and{V}_2$ are the final pressure and volume of the gas.

Thus, $P_2=\frac{P_1{V}_1}{V_2}$

Hence, $P_2=\frac{3X5}{7.5}$
= 2 atm