In 280 g of a solution of zinc chloride with a mass fraction of 15% was dissolved 12 g of the same salt. The mass of zinc chloride in the resulting solution is …
The mass of zinc chloride in a given solution before the addition of the zinc salt.
m (ZnCl2) = W (ZnCl2) • m (solution) / 100% = 15% • 280 g / 100% = 42 g.
Mass of zinc chloride in solution after salt dissolution.
m (ZnCl2) = m (out. ZnCl2) + m (add. ZnCl2) = 42 g + 15 g = 57 g.
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