Another 15 g of glucose was added to 150 g of a 20% glucose solution. Calculate the mass fraction

Another 15 g of glucose was added to 150 g of a 20% glucose solution. Calculate the mass fraction of glucose in the resulting solution.

We calculate the mass of the solute glucose in the solution:

mr.w. (C6H12O6) = (mr-ra (C6H12O6) * w.w.) / 100% = (150 g * 20%) / 100% = 30 g.

Let’s find the total mass of glucose:

mtot. (C6H12O6) = m.w. (C6H12O6) + madd. (C6H12O6) = 30 g + 15 g = 45 g.

Let’s calculate the mass fraction of glucose in the resulting solution:

Since we added 15 g of glucose, the mass of the solution also increased by 15 g.

wr.v. = (mtot. (C6H12O6) * 100%) / mp-pa = (45 g * 100%) / (150 g + 15 g) = 27.27%.

Answer: 27.27%