c
\(PV = \mu RT\) \(\frac{{{T_2}}}{{{T_1}}} = \left( {\frac{{{P_2}}}{{{P_1}}}} \right)\,\left( {\frac{{{V_2}}}{{{V_1}}}} \right) = \left( {\frac{{2{P_1}}}{{{P_1}}}} \right)\,\left( {\frac{{3{V_1}}}{{{V_1}}}} \right) = 6\)
\({T_2} = 6{T_1} = 6 \times 300\)\( = 1800\,K = 1527^\circ C.\)