Answer
8.3 mL
Work Step by Step
We find:
$M_{1}V_{1}=M_{2}V_{2}$
$(18.0\,M)V_{1}=(0.30\,M)(500\,mL)$
$\implies V_{1}=\frac{(0.30\,M)(500\,mL)}{18.0\,M}=8.3\,mL$
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