A 5.5 g sample of a substance contains only carbon and oxygen. Carbon makes up 35% of the mass of the substance. The rest is made of oxygen. You are asked to determine the mass of oxygen in the sample.

Question

Leanna Ball

Chemistry

19 August, 20:27

A 5.5 g sample of a substance contains only carbon and oxygen. Carbon makes up 35% of the mass of the substance. The rest is made of oxygen. You are asked to determine the mass of oxygen in the sample.

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Amiah Ingram · Answer 1

Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture. We calculate as follows:

Percent O2 = 100 - 35 = 65%

Mass of oxygen = 5.5 x 0.65 = 3.575 g O2