Question

1 g H2 gas expand at STP to occupy double of its original volume. The work done during the process is
(1) 260 cal
(2) 180 cal
(3) 130 cal
(4) 270 cal​

Answer 1

Answer:

4) 270 cal

Explanation:

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=21=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.

Answer 2

Last one is the ryt ans