A weighed portion of salt weighing 3 grams was dissolved in water weighing -? gr. …

A weighed portion of salt weighing 3 grams was dissolved in water weighing -? gr. … This resulted in a solution with a mass fraction of salt of 4.76%. Find the unknown value.

To solve this problem, we write down the given: m (salt) = 3 g, w = 4.76% or 0.0476
Find: mass of water -?
Decision:
To solve this problem, we write down the formula for calculating the mass fraction;
w = m (substance) / m (solution)
Let’s calculate the mass of the solution.
m (solution) = m (substance) / w
Substitute the data into the formula and get:
m (solution) = 3 / 0.0476 = 63 g
The solution consists of a solvent, in our case water and a solute, in our case a salt.
In order to calculate the mass of water, it is necessary to subtract the mass of salt from the mass of the entire solution.
m (H2O) = 63 g – 3 g = 60 g
Answer: the mass of water is 60 g