The gas laws
3 marks · EasyA student pumps air into a sealed cylinder. The initial pressure is 90 kPa and the volume is 150 cm³.
If the student reduces the volume to 100 cm³ at constant temperature, calculate the final pressure.
State the gas law used in this calculation.
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(a) 135 kPa
(b) Boyle's Law
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Marking points
M1 (a) · 1 mark · Substitutes correctly into Boyle's Law: p_1 V_1 = p_2 V_2
A1 (a) · 1 mark · Arrives at correct final pressure (135 kPa or equivalent) (follow-through)
B1 (b) · 1 mark · Identifies Boyle's Law as the relevant gas law
Worked solution
a) Use Boyle's Law:
p_1 = 90 kPa; V_1 = 150 cm³; V_2 = 100 cm³; p_2 = ?
b) The law used is Boyle's Law.