Question

carbon can react with hydrogen to form several different compounds. two compounds that contain only carbon and hydrogen are methane and ethylene. select the statement that is an example of the law of multiple proportions. \bigcirc the mass ratio of carbon to hydrogen in methane is 3:1. the mass ratio of carbon to hydrogen in ethylene is 6:1. \bigcirc two different samples of methane have the same ratio of carbon to hydrogen. two different samples of ethylene have the same ratio of carbon to hydrogen. \bigcirc when carbon and hydrogen react to form ethylene, the mass of ethylene formed is equal to the mass of carbon and hydrogen that reacted. when carbon and hydrogen react to form methane, the mass of methane formed is equal to the mass of carbon and hydrogen that reacted.

Explanation:

1. Recall the law of multiple proportions: When two elements form multiple compounds, the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers.
2. Analyze each option:

• First option: Methane and ethylene are compounds of C and H. The mass ratio of C to H in methane is 3:1, in ethylene is 6:1. The ratio of these ratios (6:1 / 3:1 = 2:1, a small whole number) follows the law of multiple proportions.
• Second option: This describes the law of definite proportions (constant composition), not multiple proportions.
• Third option: This describes the law of conservation of mass, not multiple proportions.

Answer:

The mass ratio of carbon to hydrogen in methane is 3:1. The mass ratio of carbon to hydrogen in ethylene is 6:1.