The gas laws

3 marks · Normal

A sample of gas is in a cylinder at a pressure of atm and a volume of dm. The gas is compressed to a volume of dm at constant temperature.

Calculate the new pressure of the gas.

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3.0 atm (±0.05)

Also accept: 3 atm

Common mistakes: Using incorrect initial values; Not using consistent units

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Marking points

M1 · 1 mark · States or uses Boyle’s law:

M2 · 1 mark · Correct substitution of values: (follow-through)

A1 · 1 mark · Arrives at correct final answer for pressure (3.0 atm), with unit. (follow-through)

Worked solution

Boyle’s law gives .

So, atm.