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What mass of a concentrated solution of nitric acid (68.0% HNO3 by mass) is needed to prepare 400.0 g of a 10.0% solution of HNO3 by mass?
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What mass of a concentrated solution of nitric acid (68.0% HNO3 by mass) is needed to

prepare 400.0 g of a 10.0% solution of HNO3 by mass?

User Dan Tumaykin
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1 Answer

5 votes

Answer:

58.8 grams.

Step-by-step explanation:

First we calculate how many HNO₃ grams are there in 400.0 g of a 10.0% solution:

  • Out of 100 g of a 10.0% solution, 10 g will be of HNO₃.
  • 400.0 g * 10.0/100 = 40 g HNO₃

Then we calculate the mass of a 68.0% solution that would contain 40 grams of HNO₃:

  • 40 g HNO₃ * 100 g Solution/68 g HNO₃ = 58.8 g
User Robi
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