Answer
Please see the work below.
Work Step by Step
We know that:
$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$
We plug in the known values to obtain:
$V_2=\frac{772\times 6.85\times 273}{760\times 308}$
$V_2=6.2L$
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