A container with nn $=10\mathrm{.}7$ moles of monatomic ideal gas slowly receives heat while the pressure in the system remains constant. The temperature of the gas rises by $$T$$T $=9\mathrm{.}75$ K$.$

Write an expression the work done by the gas.

Using your expression from part $($a$),$ how much work, in joules, was done by the gas?