Answer:
1.
Mss of solute : 25g
Mass of solution: 250 g
M%= (mass of solute/mass of solution)(100%)
=(25g/250g)(100%)
= (0.1)(100%)
= 10% is the percent by mass of salt in the saltwater
2.
Mss of solute : 3.5g
Mass of solution: 500g
M%= (mass of solute/mass of solution)(100%)
=(3.5g/500g)(100%)
= (0.007)(100%)
= 0.7 % is the percent by mass of cofee powder in the water
3.
Mss of solute : 125g
Mass of solution: 950 g
M%= (mass of solute/mass of solution)(100%)
=(125g/950g)(100%)
= (0.1316)(100%)
= 13.6% is the percent by mass of sugar in the water
