200 g of solution contains 10 g of salt. What is the mass fraction of salt in the solution?

Let’s write down the formula for finding the mass fraction of a substance:

u (substance) = (m (substance): m (solution)) * 100%;

In our case, the substance is salt, the solution remains a solution. Knowing all the values, we find the mass fraction of salt in the solution:

u (salt) = (m (salt): m (solution)) * 100% = (10 g: 200 g) * 100% = 0.05 * 100% = 0.5%.