During which process is all the heat absorbed by the system completely converted into work?

$1.0 \ mol$ of a monoatomic ideal gas is expanded from state $(1)$ to state $(2)$ as shown in the figure. Calculate the work done for the expansion of the gas from state $(1)$ to state $(2)$ at $298 \ K$.

Identify the state functions and path functions out of the following: enthalpy,entropy,heat,temperature,work,free energy.

In a reversible isothermal process,the change in internal energy is

Which of the following statements is true?

Find the constant external pressure required to expand a gas from $2.5 \ L$ to $4.5 \ L$ if the amount of work done is $500 \ J$ at $298 \ K$. (in $bar$)