Question

Calculate the mass precent of a solution obtine by mixing 100 g of 10% urea solution with 150 g of 15% urea solution.

Answer 1

Correct Answer - 0.13
Mass of urea in 100 g of 10% solution = `100xx0.1=10 g`
Mass of urea in 150 g of 15% solution `=150xx0.15=22.5g`
Total mass of urea 10+22.5=32.5 g
Total mass of solution = 100+150=250 g
`therefore "Mass percent of urea"=("Mass of urea")/("Mass of solution")xx100=((32.5g))/((250g))xx100=13%`.