How much heat is produced when 4.50g methane gas is burnt in a constant pressure system.

 

Two mol of an ideal gas is expanded isothermally and reversibly at 300 K to twice the original volume. Calculate q, w, E, and H.

 

1.5 mol of a perfect gas at 300 K is compressed reversibly and isothermally from a pressure of 1.01x10^5 N m^2 to 5.05x106 Nm^2. Calculate the amount of work done.

 

The heat of combustion of napthalene (C10H8(s)) at constant volume was measured to be 5133 kJ mol^1 at 298K. Calculate the value of enthalpy change (Given R = 8.314 JK^1 mol^1).

 

A sample of gas is compressed by an average pressure of 0.50 atmosphere so as to decrease its volume from 400cm^3 to 200cm^3. During the process 8.00 J of heat flows out to surroundings. Calculate the change in internal energy of the system.