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Question

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.
  1. 70.0 g conc. HNO3
  2. 54.0 g conc. HNO3
  3. 45.0 g con. HNO3
  4. 90.0 G con. HNO3


Solution

The correct option is C 45.0 g con. HNO3
Molarity=W×1000MW×Sol(ml)2=W63×1000250
W=632g; Mass of acid×70100632
Mass of acid = 45 g

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