Answer
$3.64\times 10^{-4}KPa$
Work Step by Step
We will use to Boyle's law to find out $ P_i$
$P_i=P_f\times \frac{V_f}{V_i}$
We plug in the known values to obtain:
$P_i=2.51\times\frac{0.0457}{315}=3.64\times 10^{-4}KPa$
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