A 116.9-g sample of nitric acid solution that is 70.0% HNO₃ (by mass) contains A) 81.8 mol HNO₃ B) 1.30 mol HNO₃ C) 1.86 mol HNO₃ D) mol HNO₃ E) none of these

Question

Quizplus · Accepted Answer

To find the number of moles of HNO₃ in the solution, we first need to calculate the mass of HNO₃ present in the solution: Mass of HNO₃ = 116.9 g × 0.70 = 81.83 g Then, we can convert this mass to moles using the molar mass of HNO₃: Molar mass of HNO₃ = 1 × 14.01 + 1 × 14.01 + 1 × 15.99 + 1 × 1.01 = 45.02 g/mol Number of moles of HNO₃ = 81.83 g ÷ 45.02 g/mol = 1.82 mol So, the best choice is B, which is the closest to the calculated value of 1.82 mol.

A 1169-G Sample of Nitric Acid Solution That Is 70