Answer
a) 100 mL
Work Step by Step
According to Charles' law,
$\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}$
Then, $V_{2} = \frac{V_{1}T_{2}}{T_{1}} = \frac{50.0mL\times(316+273.15)K}{(21.5+273.15)K}$ = 100. mL
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