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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 by weight)


A
90 g
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B
45 g
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C
70 g
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D
54 g
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Solution

The correct option is B 45 g
Molarity=moles of solute of HNO3total volume of solution (mL)×1000
2=moles of solute of HNO3250×100
Moles of solute = 0.5 moles
Mass of 0.5 moles = moles × molar mass of HNO3=0.5×63=31.5 g
Mass of HNO3 in 70 % concentrated acid =31.570×100=45

Chemistry

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