MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and ThermochemistryIntroduction to Thermodynamics
One mole of an ideal diatomic gas (Cv = 5 cal) was transformed from initial 25°C and 1 L to the state when temperature is 100°C and volume 10 L. The entropy change of the process can be expressed as (R = 2 calories/mol/K) (a) 3 n 2 n10 373 (b) 5 n 2 n10 298 (c) 7 n 2 n (d) 5 n 2 n
Answer
B
Explanation
2 2 v 1 1 T V S nC ln nR ln T V Given, n = 1, v C 5 , R = 2 cal/mol/K 2 1 T 100 C 100 273 K 373K T 25 C 25 273 K 298K 1 2 V 1 L, V 10 L Putting all the values, 2 2 v 1 1 T V S nC ln nR ln T V 373 10 S 1 5 ln 1 2 ln 298 1 >> >>xx xx 373 S 5ln 2ln10 298 >>
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