Answer
$P_2=2.84atm$
Work Step by Step
According to Gay-Lussac's law
$\frac{P_1}{T_1}=\frac{P_2}{T_2}$
This can be rearranged as
$P_2=\frac{P_1T_2}{T_1}$.......eq(1)
$T_1=25+273.15=298.15K$
$T_2=355+273.15=628.15K$
We plug in the known values in eq(1) to obtain:
$P_2=\frac{1.35\times 628.15}{298.15}=2.84atm$
