Chapter 1 - Chemical Foundations - Active Learning Questions - Page 33: 4

Part A: iii Part B: v

For part A, the law of conservation of mass dictates that when combining two more or substances, the final mass of the mixture will always be equal to the sum of the two or more parts. Therefore, when combining 180.0 g of sugar with 100.0 g of water, the mass of the solution will be exactly the sum of the two parts, 280.0 g. For part B, it is difficult to determine exactly the final volume of dissolving 100 mL of sugar in 100 mL of water, but tests have shown that it will be much less than 200 mL since the sugar is broken down when dissolved.