How many grams of concentrated NITRIC ACID solution should be used to prepare 250ml

CBSE Class 12
1

How many grams of concentrated NITRIC ACID solution should be used to prepare 250ml of 2M NITRIC ACID? The concentrated acid is 70% NITRIC ACID {HNO3}

2

No. of moles = (250×1000)/2
= 0.5 moles
No. of moles = molarity × volume
Requird mass of HNO3 = 0.5 × 63
= 31.5 gm
70 gm of HNO3 are present in 100 gm of solution,
So 1 gm will be present in 100/70 gm of solution.
31.5 gm be present in (100/70)× 31.5 gm of solution
= 45 gm