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Calculate the concentration of nitric ac...

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%.

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Mass percent of 69 % means that 100 g of nitric acid solution contain 69 g of nitric acid by mass. Molar mass of nitric acid `(HNO_(3)) = 1 + 14 + 48 = 63 g mol^(-1)`
Moles in 69 g `HNO_(3) = (69 g)/(63 g mol^(-1)) = 1.095` mole
Volume of 100 g nitric acid solution `= (100 g)/(1.41 g m L^(-1)) = 70.92 mL = 0.07092 L`
Conc. of `HNO_(3)` in moles per litre `= (1.095)/(0.07092 L) = 15.44 M`
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