Question: Observer A notes that water always consists of 11.1% hydrogen and 88.9% oxygen by weight, while hydrogen peroxide always consists of 5.88% hydrogen and 94.1% oxygen by weight. Observer B notes that in the formation of water 800g of oxygen always combines with 100g of hydrogen, while in the formation of hydrogen peroxide 1600g of oxygen combines with 100g of hydrogen.

a. Whose observations illustrate the law of

i. combining volumes?

ii. constant proportions?

iii. multiple proportions?

b. Show how to deduce what B sees from A's observations.

c. Explain in what way B's observations suggest that atoms exist.