Find the percentage composition of calcium in the following compound, round to the nearest hundredth of a percent.
To find the percentage composition of calcium in a compound, you need to know the formula of the compound and the molar mass of each element present.
Let's assume the compound is CaCO3 (calcium carbonate).
Calculate the molar mass of CaCO3:
Ca: 40.08 g/mol
C: 12.01 g/mol
O: 16.00 g/mol
Molar mass of CaCO3 = 40.08 + 12.01 + (3 x 16.00) = 100.09 g/mol
Next, find the molar mass of calcium in CaCO3:
% composition of calcium = (molar mass of Ca / molar mass of CaCO3) x 100
% composition of calcium = (40.08 / 100.09) x 100 = 39.99%
Therefore, the percentage composition of calcium in CaCO3 is approximately 40.00%.