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  • 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 %.

1.6   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 percent of nitric acid in it being 69%.

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Given the mass percentage of nitric acid is 69\%.

That means 69 grams of nitric acid are present in 100 grams of nitric acid solution.

The molar mass of nitric acid HNO_{3} is 1+14+ 3\times (16) = 63g\ mol^{-1}.

So, the number of moles in 69g of Nitric acid:

  = \frac{69}{63}\ moles = 1.095\ moles

and volume of 100g of the nitric acid solution:

=\frac{100}{1.41}mL = 70.92mL = 0.07092\ L

Therefore, the concentration of Nitric acid in moles per litre is:

= \frac{1.095}{0.07092} = 15.44\ M

 

Posted by

Divya Prakash Singh

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