Final answer:
The percentage composition of the compound from the ore of calcium is 29.40% calcium and 47.04% oxygen.
Step-by-step explanation:
The percentage composition of a compound indicates the percentage by mass of each element present in the compound. In the provided scenario, a student has analyzed an ore of calcium and found that it contains 13.61 g of calcium and 21.77 g of oxygen in a sample weighing 46.28 g. To calculate the percentage composition, the mass of each element is divided by the total mass of the compound and then multiplied by 100.
To find the percentage of calcium in the compound, divide the mass of calcium (13.61 g) by the total mass of the sample (46.28 g) and multiply by 100:
(13.61 g Ca / 46.28 g sample) × 100 = 29.40% Ca
To find the percentage of oxygen in the compound, divide the mass of oxygen (21.77 g) by the total mass of the sample (46.28 g) and multiply by 100:
(21.77 g O / 46.28 g sample) × 100 = 47.04% O
The percentage composition of the compound is therefore 29.40% calcium and 47.04% oxygen.