Question

the amount of heat exchanged with the surrounding at constant temp and pressure is given by the quantity

Answer 1

When a gas is heated at constant volume,no
external work is done and so the heat supplied
is consumed only in increasing the internal
energy of a gas.
But if the gas is heated at constant pressure ,
the gas expands against the external pressure
so does some external work.In this case the
supplied heat is used up in increasing the
internal energy of the gas and in doing some
external work .
Since the internal energy is depends only on
temperature,for the same rise of temperature
the internal energy of a mass of a gas will
increase by the same amount whether the
pressure or volume remains constant.But since
external work is additionally done for constant
pressure than at constant volume to produce
the same rise in temperature of the gas.
Above is the reason for Cp is greater than Cv.

Answer 2

Answer:

The amount of heat exchanges with the surroundings at constant temperature and pressure

is given by the quantity.

a) E b) H c) S d) G