STANDARDChemistry-Solutions
STANDARD Chemistry Molarity MCQ Question
Type: MCQ-numerical-Medium-Class 12
Calculate molarity of 63% w/w HNO₃ solution if density is 1.4 g/mL.
A
14 M
B
12 M
C
10 M
D
8 M
Correct Answer
Option A
Detailed Explanation
63% nitric acid by mass means that mass of nitric acid = 63 g. Mass of solution = 100 g. Molar mass of HNO₃ = 63 g/mol. Moles of HNO₃ = 1 mole. Density of solution = 1.4 g/mL. Volume of solution = 100 g / 1.4 g/mL = 71.428 mL = 0.071428 L. Molarity of solution = Moles of solute / Volume of solution in L = 1.0 / 0.071428 = 14 M.
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