Question

18 g water decomposes to give 2 g of H, and 16 g of o, whereas 10, combines with 02,
H, to give 1.8 g of water. Show that these data confirm the law of constant proportions.​

Answer 1

Explanation:

The law of constant proportions states that the proportions of elements in a pure compound are always the same, regardless of the size of the sample or the source of the sample.

In this case, the data shows that 18 g of water decomposes to give 2 g of hydrogen (H) and 16 g of oxygen (O), which confirms the law of constant proportions. The ratio of H to O in the water is 2 g H to 16 g O, which is the same as the ratio of H to O in the hydrogen molecule (H2).

Similarly, the data also shows that 10 g of hydrogen combines with 2 g of oxygen to give 1.8 g of water, which confirms the law of constant proportions. The ratio of H to O in the water produced is 10 g H to 2 g O, which is the same as the ratio of H to O in the hydrogen molecule (H2).

Therefore, the data confirms the law of constant proportions, as the ratios of elements in the water, the hydrogen, and the oxygen remain constant regardless of the amount of material present.