Determine the molarity of a solution made by dissolving 11.7 g of Ca(NO₃)₂ in water where the final volume of the solution is 250.0 mL.

Question

Quizplus · Accepted Answer

1. Calculate the number of moles of Ca(NO₃)₂: m = 11.7 g Molar mass of Ca(NO₃)₂ = 164.29 g/mol n = m/M = 11.7 g/164.29 g/mol = 0.0712 mol 2. Calculate the molarity: Molarity = n/V V = 250.0 mL = 0.250 L Molarity = 0.0712 mol/0.250 L = 0.2848 M ≈ 0.285 M Therefore, the best choice is C) 0.285M.

Determine the Molarity of a Solution Made by Dissolving 11