Answer
$1.02\times 10^{3}L$
Work Step by Step
According to Boyle's law
$V_f=V_i\times \frac{P_i}{P_f}$
We plug in the known values to obtain:
$V_f=50.0\times \frac{19.8}{0.974}=1.02\times 10^{3}L$
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