Question:
Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1 and the mass per cent of nitric acid in it being 69%.
Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1 and the mass per cent of nitric acid in it being 69%.
Updated On: Jan 20, 2026
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Solution and Explanation
Mass percent of nitric acid in the sample = 69 % [Given]
Thus, 100 g of nitric acid contains 69 g of nitric acid by mass.
Molar mass of nitric acid (HNO3)
= {1 + 14 + 3(16)} g mol-1
= 1 + 14 + 48
= 63 g mol-1
∴ Number of moles in 69 g of HNO3
= \(\frac {69 \ g}{63 \ g\ mol^{-1}}\)
= 1.095 mol
Volume of 100g of nitric acid solution
= \(\frac {\text {Mass \ of\ solution} }{\text {density\ of\ solution}}\)
= \(\frac {100 \ g }{1.41\ g ML^{-1}}\)
= 7\(0.92\) mL
= \(70.92×10^{-3}\) L
= \(15.44\) mol/L
∴ Concentration of nitric acid = \(15.44\) mol/L
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Chemistry is a vast subject and for understanding its significance we can take help of following points:
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Classification of Matter
There are two ways of classifying the matter:
(A) Physical Classification:
Matter can exist in three physical states:
- Solids - have definite volume and definite shape
- Liquids - have definite volume but not definite shape.
- Gases - have neither definite volume nor definite shape.
(B) Chemical Classification:
Based upon the composition, matter can be divided into two main types:
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