Calculate the concentration in % (m/m) of a solution containing 12.5 g of NaCl dissolved in 250.0 g of H2O.
Group of answer choices
50.0% (m/m)
0.05% (m/m)
5.00% (m/m)
20.0% (m/m)
Let us calculate the mass of NaCl dissolved in 100 g of H2O which will give us % (m/m) of solution.
As, 12.5 g of NaCl is dissolved in 250 g of H2O, we can consider
250 g of H2O = 12.5 g of NaCl
For 100 g of H2O = (12.5 g x 100 g) / 250 g
= 5
Therefore, the answer is 5.00% (m/m)
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