What is the mass of oxygen in 12.3 g of C₃H₆O?

Question

Quizplus · Accepted Answer

The chemical formula for the compound given is C₃H₆O. In this formula, there is only one atom of oxygen (O). The atomic mass of oxygen is approximately 16 g/mol. Therefore, the mass of one oxygen atom is approximately 16/6.022 × 10^23 g = 2.657 × 10^-23 g. To determine the mass of oxygen in 12.3 g of the compound, we need to calculate the number of oxygen atoms present in the sample and then multiply by the mass of one oxygen atom. The molar mass of the compound can be calculated as follows: (12.01 + 32.06 + 1.01 + 32.06 + 1.01 + 16.00) g/mol = 94.15 g/mol The number of moles of the compound present in the sample can be calculated as follows: moles = mass/molar mass = 12.3 g/94.15 g/mol = 0.1306 mol Therefore, the number of oxygen atoms present in the sample is 0.1306 mol × 1 atom/mol = 0.1306 atoms. Multiplying the mass of one oxygen atom by the number of atoms present gives the mass of oxygen in the sample: 0.1306 atoms × 2.657 × 10^-23 g/atom = 3.39 × 10^-24 g ≈ 3.39 mg. Therefore, the mass of oxygen in 12.3 g of the compound is 3.39 g.

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