First slide

Gaseous state

Question

A vessel of volume 0.2 m³ contains H₂ gas C_v = 5 cal mol^-1 K^-1 at 300K and 1 atm pressure. The heat required to raise the temperature to 400 K is---- k calories

Moderate

Solution

$Q_{V} = n \times C_{V} \times dT = \frac{pV}{RT} \times C_{V} \times dT = \frac{1 \times 0 .2 \times 10^{3} \times 5 \times 100}{0 .0821 \times 300} = 4 .06 \times 10^{3} cal \approx 4 kcal$

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