A compound is found to consist of 2.89 g of calcium and 5.11 g of chlorine. what is the percent by mass of calcium in the compound

To get the percent mass of calcium, first let us compute for the total mass:

total mass = 2.89 g + 5.11 g

total mass = 8 g

So the percent mass of calcium is:

% calcium = (2.89 / 8) * 100% = 36.125%