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From the $PV=nRT$ we can conclude that $n=(PV)/(RT)$.

If the pressure $P$, the volume $V$ and the temperature $T$ of the gas change between two points, this change can be illustrated by:

$n=(P_1V_1)/(RT_1)=(P_2V_2)/(RT_2)$

Therefore, this expression can be modified as:

$(P_1V_1)/(cancel(R)T_1)=(P_2V_2)/(cancel(R)T_2)=>(P_1V_1)/(T_1)=(P_2V_2)/(T_2)$

Thus, $V_2=(P_1V_1)/(T_1)xx(T_2)/(P_2)$

$V_2=(2.9cancel(atm)xx19.5L)/(278.5cancel(K))xx(338cancel(K))/(1.5cancel(atm))=45.8L$

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