The law of multiple proportions is illustrated by which pair of compounds?

Model Answer & Options

Source: Extra Practice

NaCl and NaBr

H2O and D2O

CO and CO2

MgO and Mg(OH)2

Explanation

The Law of Multiple Proportions states that if two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers. Carbon and Oxygen form CO and CO2. In CO, 12g C reacts with 16g O. In CO2, 12g C reacts with 32g O. The ratio of oxygen (16:32) is 1:2. NaCl/NaBr involve different elements (Cl vs Br). H2O/D2O involve isotopes.

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