A sample of an ideal gas undergoes a process (4 atm, 40 L) to (1 atm, 150 L). If the internal energy of gas decreases by 10 L-atm, H for the gas is

 

5 moles of an ideal gas (Cp,m= 2/7 R) is heated from 27ºC to 87ºC. The value of H is.

 

90 gm water is completely converted into stream at 100ºC and 1 atm. The internal energy of system (latent heat of vaporisation of water at 100ºC= 540 cal/gm)

 

Two moles of an ideal monoatomic gas is heated from 27ºC to 127ºC.The change internal energy of gas is:

 

500 gm ice at 0ºC is added in 2000 gm water at tºC. If the final temperature of system is 0ºC, then the value of 't' is (latent heat of fusion of ice =80 cal/gm and specific heat capacity of water= 1 cal/gm-ºC)