Answer
$p=30~atm$
Work Step by Step
$1~atm = 101,325~Pa$ or $1~Pa = \frac{1}{101,325}atm$
$p=3\times 10^{6}~Pa=3\times 10^{6}~Pa\times \frac{1~atm}{101,325~Pa}=30~atm$
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