The gas laws
4 marks · NormalA student fills a flexible balloon with air and seals it. The pressure inside the balloon is kPa at C. The balloon is then placed in an oven at C and the pressure reaches kPa.
Convert all temperatures to Kelvin.
Use the gas law to calculate the new volume of the balloon if the initial volume was L.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 20°C = 293 K; 50°C = 323 K
(b) 2.31 L
Common mistakes: Forgetting to convert to K; Incorrect rearrangement
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States both temperatures in Kelvin.
M1 (b) · 1 mark · Uses correctly.
M2 (b) · 1 mark · Correctly substitutes and rearranges for . (follow-through)
A1 (b) · 1 mark · Final answer correct to 2 decimal places with unit. (follow-through)
Worked solution
a) C = 293 K, C = 323 K.