If three moles of an ideal gas at 300 K expand isotherrnally from 30 dm3 to 45 dm3 against a constant opposing pressure of 80 kPa, then the amount of heat transferred is_______ J.

Question

Prashant Kotian · Accepted Answer

Correct answer: .. Using, first law of thermodynamics, U = Q + W, U = 0 : Process is isothermal Q = – W W = – PextV : Irreversible = -80 × 103 ( 45 – 30) × 10-3 = –1200 J

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