what is the volume of the solution in milliliters?

Question

If 3.90g of CuNO3 is dissolved in water to make a 0.840 M solution, what is the volume of the solution in milliliters? 

Volume: ? mL

Answer 1

molar mass CuNO₃ = 125.6 g / mol

0.840 M = 0.840 moles / L

3.90 g x 1 mol / 125.6 g = 0.0311 mols CuNO₃

0.0311 mols / x L = 0.840 mols / 1 L

x = 0.0370 L x 1000 ml / L = 37.0 mls (3 sig.figs.)