Answer
38500 mmHg
Work Step by Step
We find:
$P_{1}V_{1}=P_{2}V_{2}$ (at constant n and T)
$\implies P_{1}=\frac{P_{2}V_{2}}{V_{1}}$
$=\frac{(721\,mmHg)(1875\,L+35.8\,L)}{35.8\,L}$
$=38500\, mmHg$
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