Question

3. You have 750 mL of a 8 M solution. How many moles are present?

Answer 1

Step 1

Data provided:

Concentration of the solution = 8 M or 8 mol/L

Volume of the solution = 750 mL

(L is needed here, not mL) => 1000 mL = 1 L => 750 mL = 0.750 L

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Step 2

Molarity = moles of solute/volume of the solution (L)

Moles must be cleared from here, therefore:

Molarity x volume of the solution (L) = moles

8 mol/L x 0.750 L = moles

6 moles = moles of solute

Answer: Moles = 6 moles