A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 75 gram sample of chemical X should contain how many grams of carbon

According to the law of definite proportion, a 75 gram sample of chemical X should contain 21.249 grams of carbon.

Explanation:

The total mass of the sample is equal to the sum of masses of oxygen, carbon and nitrogen. That is:

If , and , then:

According to the law of definite proportion, the following simple rule of three is used:

If , and , then:

According to the law of definite proportion, a 75 gram sample of chemical X should contain 21.249 grams of carbon.

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