In an isothermal expansion change in internal energy and work done by the gas are respectively

During isothermal expansion of an ideal gas, its internal energy

A sample of an ideal gas undergoes on isothermal expansion. If dQ, dU and dW represent the amount of heat supplied, the change in internal energy and the work done respectively,then

Assertion: If a gas is heated isothennally, then no part of the heat supplied is used to increase the internal energy. Reason: Change in internal energy equals work done on the system.

Assertion: If a gas is heated isothennally, then no part of the heat supplied is used to increase the internal energy. Reason: Change in internal energy equals work done on the system.

Whether in isothermal expansion of an ideal gas the work done by the gas equals the heat absorbed ?

n moles of an ideal monoatomic gas undergoes an isothermal expansion at temperature T, during which its volume becomes 4 times. The work done on the gas and change in internal energy of the gas respectively are