Gas Laws Calculations
IGCSE Edexcel Physics
5.20-5.22 Gas Laws
Key Concepts:
At constant volume, $p/T$ is constant. At constant temperature, $pV$ is constant.
Section A: Constant Volume
1. A gas has pressure 90 kPa at 300 K. Find pressure at 360 K (constant volume).
[2]
Section B: Constant Temperature
2. A gas has volume $1.5\,dm^3$ at 120 kPa. Find volume at 200 kPa.
[2]
Total marks: 4
Mark Scheme
1.
$p_2 = p_1 T_2/T_1 = 90 \times 360/300 = 108\,kPa$ [2]
2.
$p_1V_1 = p_2V_2$, $V_2 = 120 \times 1.5 / 200 = 0.9\,dm^3$ [2]