How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M `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. `NHO_(3)`
D. 45.0 g conc. `HNO_(3)`

Answer

D

Explanation

Molarity `=("Moles of" HNO_(3))/("Vol. of solution")xx1000`
`2=("mass"//63)/(100)xx63=31.5`
Mass of `HNO_(3)` required for 70% solution
`=(31.5xx100)/(70)=45.0g`