In 280 g of a solution of zinc chloride with a mass fraction of 15% was dissolved 12 g of the same salt.
| January 31, 2021 | education
In 280 g of a solution of zinc chloride with a mass fraction of 15% was dissolved 12 g of the same salt. Determine the mass of zinc chloride in the resulting solution.
The mass of zinc chloride in the original solution.
m (ZnCl2) = W (ZnCl2) • m (solution) / 100% = 15% • 280 g / 100% = 42 g.
The mass of the solution increased after adding salt.
m (solution) = m (original solution) + m (ZnCl2) = 280 g + 12 g = 292 g.
Total mass of salt.
m (ZnCl2) = m (ZnCl2) ref. + m (ZnCl2) add. = 42 g + 12 g = 54 g.
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