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molar specific heat at constant pressure.

It is defined as the amount of heat required to raise the temperature of one mole of a gas through 1⁰C when it's pressure is kept constant.

molar specific heat at constant volume.

It is defined as the amount of heat required to raise the temperature of one mole of a gas through 1⁰C when it's volume is kept constant.

What is specific heat ?

Answer:- The specific heat capacity of a body is defined as the amount of heat  required to raise the temperature of unit mass of that substance through 1°C.