Convert 12.0 g of FeO into moles.
1 mole
71.85 moles
5.99 moles
O.17 moles

D. The volume of the solvent used was less than 5 liters.

Explanation:

(MV) before dilution = (MV) after dilution.

M before dilution = 10.0 M, V before dilution = V of stock = ??? L.

M after dilution = 1.0 M, V after dilution = 5.0 L.

V before dilution = V of stock = (MV) after dilution/M before dilution = (1.0 M)(5.0 L)/(10.0 M) = 0.5 L.

∴ The volume of the stock used is 0.5 L.

The volume of the solvent used is 4.5 L.

D. The volume of the solvent used was less than 5 liters.