The gas laws
2 marks · EasyA fixed mass of gas has a pressure of 80 kPa and a volume of 200 cm³. If the volume is reduced to 160 cm³ at constant temperature, calculate the new pressure of the gas.
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100 kPa (±2)
Also accept: 100000 Pa
Common mistakes: Incorrect rearrangement of Boyle's Law; Using incorrect initial/final values
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Marking points
M1 · 1 mark · Uses Boyle's Law correctly: p_1 V_1 = p_2 V_2, sets up calculation with correct numbers
A1 · 1 mark · Arrives at correct value for new pressure (100 kPa) or equivalent in Pa (follow-through)
Worked solution
p_1 = 80 kPa, V_1 = 200 cm³; V_2 = 160 cm³; p_2 = ?