A 26.6 g sample of an unknown compound contains 0.8 g of oxygen. What is the percent by mass of oxygen in the compound?
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To find the percent by mass of oxygen in the compound, you need to divide the mass of oxygen by the total mass of the compound and then multiply by 100.
First, calculate the mass of oxygen in grams. Given that the sample contains 0.8 g of oxygen, this is our numerator.
Next, calculate the total mass of the compound. Given that the sample contains 26.6 g of the unknown compound, this is our denominator.
So, the percent by mass of oxygen in the compound can be calculated as follows:
Percent by mass of oxygen = (Mass of oxygen / Total mass of compound) × 100
Percent by mass of oxygen = (0.8 g / 26.6 g) × 100
Calculating this expression gives:
Percent by mass of oxygen = (0.030075 × 100) ≈ 3.01%
Therefore, the percent by mass of oxygen in the compound is approximately 3.01%.