5 g of salt was dissolved in 45 g of water. Calculate the mass fraction of salt in the resulting solution.

1) Find the total mass of the resulting solution.

To do this, we apply the formula: mass of solution = mass of solvent + mass of solute.

Let’s substitute the values ​​from the condition of the problem into the formula:

mass of solution = mass of water + mass of salt = 45 + 5 = 50 (g).

2) Calculate the mass fraction of salt in the resulting solution.

To do this, apply the formula: mass fraction of solute = mass of solute: mass of solution * 100%.

Let’s substitute into this formula the values ​​from the condition of the problem: mass fraction of salt in solution = 5: 50 * 100% = 10%.

Answer: you get a 10% aqueous solution of salt.