MCQ Solution: States of Matter
A sample of gas occupies 300 dm3 at 27oC and 750 pressure. What contraction in volume takes place, when the gas is cooled to - 33oC at 750 mm pressure?
1) 120 dm3
2) 240 dm3
3) 60 dm3
4) No change in volume
SOLUTION
At constant pressure, V1 /T1 = V2 /T2 ;
V1 = 300 dm3 ;
V2 = ?, T1 = 300K, T2 = 273 – 33 = 240 K;
V2 = (V1 /T1 ).T2 = (300/300) ´ 240 = 240 dm3
decrease in volume = 300 – 240 = 60 dm3
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