Question

Calculate the number of moles of Cu^2+ in 400.0 mL of 0.300 M CuSO4 solution.

a. 0.012 moles
b. 0.120 moles
c. 0.180 moles
d. 0.240 moles

Answer 1

To calculate the number of moles of Cu²⁺ in 0.400 L of a 0.300 M CuSO₄ solution, multiply the molarity by the volume to get 0.120 moles.

Step-by-step explanation:

To calculate the number of moles of Cu2+ in 400.0 mL (or 0.400 L) of 0.300 M CuSO4 solution, we use the molarity formula:

Molarity (M) = Moles of solute (n) / Volume of solution in liters (L)

First, rearrange the molarity formula to solve for moles:

Moles of solute (n) = Molarity (M) × Volume of solution in liters (L)

Next, plug in the given molarity and volume:

n(Cu2+) = 0.300 M × 0.400 L

n(Cu2+) = 0.120 moles

The correct answer is (b) 0.120 moles of Cu2+.