First slide

First law of thermodynamics

Question

A vessel contains 5 mole of O₂ . The system is given heat at constant pressure. As a result the gas expands and does 120 joule work. Heat given to the gas is:

Easy

A

310 J
B

390 J
C

420 J
D

560 J

Solution

$W = nR ∆ T = 120, Q = {nC}_{P} ∆ T = n (\frac{7}{2} R) ∆ T = \frac{7}{2} W = \frac{7}{2} \times 120 = 420 J .$

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