Final answer:
The compound with the greatest percent composition of oxygen is SO2, or sulfur dioxide, with 66.7% oxygen.
Step-by-step explanation:
The compound with the greatest percent composition of oxygen is SO2, or sulfur dioxide. In this compound, there are two oxygen atoms for every one sulfur atom. This means that the percent composition of oxygen in SO2 is 66.7%. Here's how you can calculate it:
First, determine the molar mass of SO2 by adding up the atomic masses of sulfur (32.07 g/mol) and oxygen (16.00 g/mol). The molar mass of SO2 is therefore 32.07 g/mol + (2 * 16.00 g/mol) = 64.07 g/mol.
Next, calculate the mass of oxygen in one mole of SO2 by multiplying the molar mass of oxygen by the number of oxygen atoms in one mole of SO2. The mass of oxygen in one mole of SO2 is (2 * 16.00 g/mol) = 32.00 g/mol.
Finally, calculate the percent composition of oxygen in SO2 by dividing the mass of oxygen by the molar mass of SO2 and multiplying by 100%. The percent composition of oxygen in SO2 is therefore (32.00 g/mol / 64.07 g/mol) * 100% = 66.7%.