How many grams of concentrated nitric acid solution should be used to prepare 250 mL of `2.0M HNO_(3)` ? The concentrated acid is `70% HNO_(3)`

Options

A. `90.0` g conc. `HNO_(3)`
B. `70.0` g conc. `HNO_(3)`
C. `54.0` g conc. `HNO_(3)`
D. `45.0` g conc. `HNO_(3)`

Answer

D

Explanation

Molarity `(M) =(wt xx 1000)/( " mol . Wt x col (ml))`
`2= (wt)/(63) gm`
wt. of `70%` acid `=(100)/( 70) xx 31.5 =45` gm