If you like sweet tea, add two teaspoons of sugar (5 g each) to 1 glass (250 g of water).

If you like sweet tea, add two teaspoons of sugar (5 g each) to 1 glass (250 g of water). What is the mass fraction of sugar in tea? 3.8%

Let’s find the mass fraction w of sugar in tea: w = (m (r.v.) / m (r-ra)) * 100%, where

m (r.v.) – the mass of the solute, that is, sugar, m (solution) – the mass of the solution, that is, tea.

We neglect the mass of the tea extract in an aqueous solution, as an infinitely small value in comparison with the mass of the main components: water and sugar. The leaves themselves are not taken into account, since they are not a component of the solution. Then we consider that the mass of the solution is the sum of the masses of water and sugar: m (solution) = 250 + 2 * 5 = 260 g

w = (10/260) * 100 * = 3.8%