Question

A drug needs to dissolve a 300.0-g solid substance in a 650-ml liquid substance (ρ = 0.87 g/ml) before it could be administered. What could be the density of the resulting solution if there were no changes in volume after the solid substance was dissolved?

Answer 1

Mass of the liquid subctance $m=650\cdot 0.87=565.5(g)$

The density of the resulting solution $(V=650 ml=const)$

$\rho=(300+565.5)/650=1.33(g/ml)$