AP BIOLOGY

Detailed explanation-1: -Density is the amount of matter an object has in a certain space.

Detailed explanation-2: -Divide the mass of solute in the solution its formula mass. If, for instance, the solution contains 100 g of potassium chloride–100 ÷ 74.55 = 1.32 moles. Divide the number of moles by the volume of solution in liters (L).

Detailed explanation-3: -Formula: number of particles = number of moles x 6 x 10 Since 1 mole of substance contains 6 x 1023 particles, 2 moles of substance contains 2 x 6 x 1023 particles. 0.5 moles of substance contains 0.5 x 6 x 1023 particles.

Detailed explanation-4: -The mean or average density is the total mass of a region divided by the total volume of that region.