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Which calculation below represents the mass of

copper(II) nitrite (MM = 155.6 g/mol) should be
weighed out to produce 250 ml of a 0.50 M solution?

1 Answer

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Answer : The mass of
Cu(NO_3)_2 in the solution is, 19.4 grams.

Explanation : Given,

Molarity of solution = 0.50 M

Volume of solution = 250 mL

Molar mass of
Cu(NO_3)_2 = 155.6 g/mole

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :


\text{Molarity}=\frac{\text{Mass of }Cu(NO_3)_2* 1000}{\text{Molar mass of }Cu(NO_3)_2* \text{Volume of solution (in mL)}}

Now put all the given values in this formula, we get:


0.50M=\frac{\text{Mass of }Cu(NO_3)_2* 1000}{155.6g/mole* 250mL}


\text{Mass of }Cu(NO_3)_2=19.4g

Therefore, the mass of
Cu(NO_3)_2 in the solution is, 19.4 grams.

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