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# How many grams of conc. nitric acid solution should be used to prepare 250ml of 2.0 M HNO3?   (1)   54.0 conc. HNO3   (2)   45.0 conc. HNO3   (3)   90.0 conc. HNO3   (4)   70.0 conc. HNO3

Arun
25763 Points
3 years ago
Dear Devesh

You have not provided the concentration of HNO3.
Please check and repost it. But I am solving it for 70% concentrated HNO3.
The required number of moles=( 250/1000)×2
=0.5 moles
(no. of moles=molarity × volume)
so,required mass of HNO3=0.5×63
=31.5 grams
(given mass=no. of moles × molar mass)
Given,
70 grams of HNO3 are present in 100 grams of the solution
so,1 gram will be present in 100/70 grams of solution
hence 31.5 grams will be present in (100/70)×31.5 grams of solution.
so amount of concentrated nitric acid solution used is 45 grams.

Regards