Question 387: Thermodynamics & KTG

Question

A cylinder with fixed capacity of 67.2 lit
contains helium gas at STP. The amount of heat
needed to raise the temperature of the gas by
20°C is : [Given that R = 8.31 J mol
–1
K
–1
]

Accepted Answer

$$\Delta Q = n{C_v}$$    $$\Delta T = n{3 \over 2}R\Delta T$$
$$ = \left( {{{67.2} \over {22.4}}} ight)\left( {{3 \over 2} 	imes 8.31} ight)\left( {20} ight)$$
$$ \approx 748\,J$$

Answer

374 J

Answer

700 J

Answer

748 J

Answer

350 J

Thermodynamics & KTG

A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20°C is : [Given that R = 8.31 J mol –1 K –1 ]

Choose the correct answer: