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Grade 11Thermal Physics

12 mole of helium is contained in a container at S.T.P. How much heatenergy is needed to double the pressure of the gas, keeping the volumeconstant? Heat capacity of gas is 3 J g–1 K–1.

Vaibhav shukla

8 Years agoGrade 11

1 Answer

Arun

8 Years ago

n = ½

Cv = 3J/gm-K

M = 4

Cv = MCv = 12 J/gm-K M = molecular mass

P2/P1 = T2/T1 = 2

Delta T = T2- T1 = 273 K

Delta Q = n Cv (Delta T)

On solving

Delta Q = 1638 J

Regards

Arun (askIITians forum expert)

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