Question

how are percent mass calculations used?

Answer 1

a.
They are used for determining concentrations in solutions and water of hydration
c.
They are used for determining water of hydration and the combustion analysis of hydrocarbons
b.
They are used for determining molecular purity and concentration in solutions
d.
None of the above

Answer 2

if I understand right since it's like determing what % fat takes in milk, sulfur in H2SO4 liquid and such.