. How many grams of concentrated nitric acid solution
should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3
A: 45.0 g conc. HNO3
B: 90.0 g conc. HNO3
C: 70.0 g conc. HNO3
D: 54.0 g conc. HNO3
Best Answer
Explanation-
1. No. of moles = Molarity Χ Volume
n= 2.0 M Χ 250mL/1000
n= 0.5
Mass of nitric acid= molar mass Χ no.of moles / Percentage composition
Molar mass of HNO3 = 1+ 14+ 16Χ 3= 63
Mass of nitric acid= 63 Χ 0.5Χ 100= 45 gm / 70
Final Answer-
So, The correct option is A.
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3?
The concentrated acid is 70% HNO3= 45.0 g conc. HNO3
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