Question Detail
Question
Calculate the number of moles in 5.00 g of Mg(NO₃)₂ (Mg=24, N=14, O=16).
Correct Answer
Option A is the correct answer.
Detailed Explanation
Molar mass Mg(NO₃)₂ = 24 + 2×14 + 6×16 = 24 + 28 + 96 = 148 g/mol. Moles = 5.00/148 = 0.0338 mol ≈ 0.0337 mol.
Hint
Moles = mass / molar mass.