Answer
124 L
Work Step by Step
$V_{1}=135\,L$
$T_{1}=(21+273)K= 294\,K$
$T_{2}= (-4+273)K=269\,K$
According to Charles's law,
$\frac{V_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}$ (unchanging P and n)
$\implies V_{2}=\frac{V_{1}T_{2}}{T_{1}}=\frac{135\,L\times269\,K}{294\,K}$
$=124\,L$
