Find the percent composition of each element in CaSO4. Be sure to add the % sign and the element. "Ca is the 1st blank "S is the 2nd blank" 'O is the 3rd blank 'GO ONE PLACE PAST THE DECIMAL IN ANSWERS" Example: If you calculated 12.346% element X, you would write your answer as: 12.3% X square square square

## Step1: Determine Molar Mass of CaSO$_4$<br />### Calculate the molar mass of each element in CaSO$_4$ and sum them to find the total molar mass. Calcium (Ca) has a molar mass of 40.08 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol. Since there are four oxygen atoms, multiply the molar mass of oxygen by 4. The total molar mass of CaSO$_4$ is $40.08 + 32.07 + (16.00 \times 4) = 136.15$ g/mol.<br />## Step2: Calculate Percent Composition of Each Element<br />### Use the formula for percent composition: $\frac{\text{mass of element in 1 mole of compound}}{\text{molar mass of compound}} \times 100\%$. For calcium: $\frac{40.08}{136.15} \times 100\% = 29.4\%$. For sulfur: $\frac{32.07}{136.15} \times 100\% = 23.6\%$. For oxygen: $\frac{64.00}{136.15} \times 100\% = 47.0\%$.