Question

1g H, gas expand at STP to occupy double of its original volume. The work done during the process is
(1) 180 cal
(2) 260 cal
(3) 130 cal
(4) 270 cal

Answer 1

Answer:

Solution:- (D) 270 cal

At STP, temperature is 273K.

As we know that,

No. of moles (n)=

Mol. wt.

wt.

Given weight =1g

Mol. wt. =2g

∴n=

2

1

=0.5 mole

R=2cal/mol−K

W=PΔV=nRT

W=0.5×2×273=273 cal≈270 cal

Hence the work done will be 270 cal.

As both, temperature and pressure are constant. Hence, we cannot conclude that the process is isothermal or isobaric.

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