In a cylinder, $1\mathrm{.}20$mol$1\mathrm{.}20$mol of an ideal monatomic gas, initially at $3\mathrm{.}60105$Pa$3\mathrm{.}60105$Pa and $300$K$300$K$,$ expands until its volume triples. Compute the work done by the gas if the expansion is isothermal. Compute the work done by the gas if the expansion is adiabatic. Compute the work done by the gas if the expansion is isobaric.