Answer
2.61 atm
Work Step by Step
$P_{1}= 3.05\,atm$
$T_{1}= (40.+273)K=313\,K$
$T_{2}= (-5.0+273)K=268\,K$
According to Gay Lussac's law, if n and V are constant:
$\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}$
$\implies P_{2}=\frac{P_{1}T_{2}}{T_{1}}=\frac{3.05\,atm\times 268\,K}{313\,K}$
$=2.61\,atm$
