Question

1. A miniature chocolate bar has a mass of 8.6 g. How much would a mole of these bars weigh?

Answer 1

1 mole of substance = 6.022 x 10²³ units of substance

1 mole of miniature chocolate bar = 6.022 x 10²³ miniature chocolate bars

mass of 1 mole of miniature chocolate bar = (mass of 1 miniature chocolate bar) * (6.022 x 10²³ miniature chocolate bars)

mass of 1 mole of miniature chocolate bar = (8.6 g) * (6.022 x 10²³ miniature chocolate bars)

mass of 1 mole of miniature chocolate bar = 5.1789 x 10²⁴ g

for two significant figures,

mass of 1 mole of miniature chocolate bar = 5.2 x 10²⁴ g