Mixed 60 g of the solution with a mass fraction of calcium nitrate of 15% and 80 g of a solution of the same salt with a mass fraction
| May 28, 2020 | Education
Mixed 60 g of the solution with a mass fraction of calcium nitrate of 15% and 80 g of a solution of the same salt with a mass fraction of 25%. Mass fraction of salt in the resulting solution is equal to
ω = m (substance) / m (solution)
Find the mass of the substance m = 60 * 0.15 + 80 * 0.25 = 29 g
Find the mass of the solution m = m (initial) + m (added) = 60 + 80 = 140 g
ω (final) = 29 * 100/140 = 20.7%
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.