What is the mass fraction of sugar in a tea solution made from 250 grams of water and 50 grams of sugar?

The mass fraction is equal to the ratio of the mass of the substance to the mass of the solution.

The mass of the substance is 50 grams (by condition);

The mass of the solution consists of the mass of water and a substance, in our case sugar:

250 + 50 = 300 grams

Now let’s find the mass fraction of sugar:

50/300 = 0.18

Let’s convert the resulting number into percent:

0.18 * 100% = 18%

Answer: 18%