Answer
$$
p_{2}=0.333
$$
Work Step by Step
The gas law in ratio form is used to obtain
$$
p_{2}=p_{1}\left(\frac{V_{1}}{V_{2}}\right)=\frac{p_{1}}{3} \Rightarrow \frac{p_{2}}{p_{1}}=\frac{1}{3}=0.333
$$
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