J.R. S. answered 12/04/21
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0.850 M means 0.850 moles CuNO3 / liter of solution.
molar mass CuNO3 = 125.6 g/mol
8.79 g x 1 mol / 125.6 g = 0.06998 moles CuNO3
0.06998 mols / x L = 0.850 mols / 1 L
x = 0.0823 L = 82.3 mls