DP Physics (last assessment 2024)

Question 18M.3.SL.TZ2.7b

Date	May 2018	Marks available	[Maximum mark: 2]	Reference code	18M.3.SL.TZ2.7b
Level	SL	Paper	3	Time zone	TZ2
Command term	Calculate	Question number	b	Adapted from	N/A

[Maximum mark: 2]

18M.3.SL.TZ2.7b

A cylinder is fitted with a piston. A fixed mass of an ideal gas fills the space above the piston.

M18/4/PHYSI/SP3/ENG/TZ2/07._01

The gas expands isobarically. The following data are available.

$\begin{array}{*{20}{l}} {{\text{Amount of gas}}}&{ = 243{\text{ mol}}} \\ {{\text{Initial volume of gas}}}&{ = 47.1{\text{ }}{{\text{m}}^3}} \\ {{\text{Initial temperature of gas}}}&{ = -12.0{\text{ °C}}} \\ {{\text{Final temperature of gas}}}&{ = + 19.0{\text{ °C}}} \\ {{\text{Initial pressure of gas}}}&{ = 11.2{\text{ kPa}}} \end{array}$

(b)

Calculate, in J, the work done by the gas during this expansion.

[2]

Markscheme

W «= PΔV» = 11.2 × 10³ × (52.7 – 47.1)

W = 62.7 × 10³ «J»

Accept 66.1 × 10³ J if 53 used

Accept 61.6 × 10³ J if 52.6 used

[2 marks]

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Option B: Engineering physics

Option B: Engineering physics » Option B: Engineering physics (Core topics) » B.2 – Thermodynamics

Option B: Engineering physics » Option B: Engineering physics (Core topics)

Question 18M.3.SL.TZ2.7b

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