Answer
1140 mL
Work Step by Step
$M_{2}=\frac{\frac{5.9\,g}{134.45\,g/mol}}{50.0\times10^{-3}\,L}=0.87765\,M$
$M_{1}V_{1}=M_{2}V_{2}$
$\implies V_{2}=\frac{M_{1}V_{1}}{M_{2}}=\frac{8.00\,M\times125\,mL}{0.87765\,M}=1140\,mL$
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