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To calculate the percent composition of a known compound, start with chemical formula of the compound and calculate the ________ which gives the mass of one mole of the compound.
formula mass. molecular mass.
To calculate the percent composition of a known compound, you need to first determine the formula mass or molecular mass of the compound.
The formula mass of a compound is the sum of the atomic masses of all the atoms in its chemical formula. This is typically used for compounds with ionic bonding, such as salts. To calculate the formula mass, you multiply the atomic mass of each element by the number of atoms of that element in the compound, and then sum up these values.
On the other hand, the molecular mass is used for compounds with covalent bonding, such as organic molecules. It is the sum of the atomic masses of all the atoms in a molecule. This calculation is similar to determining the formula mass, but it focuses on the individual molecules rather than the overall compound.
So, to calculate the percent composition of a compound, you would need to calculate the formula mass or molecular mass of the compound first. Then, you can determine the percent composition by dividing the mass of each element in the compound by the total mass of the compound and multiplying by 100. This will give you the percent of each element present in the compound.