Final answer:
To calculate the number of moles in a compound, divide the mass of the compound by its molar mass. The number of moles of each type of atom in a compound is equal to the number of atoms of that element in 1 mole of the compound.
Step-by-step explanation:
To calculate the number of moles in a compound, we need to know the molar mass of the compound. The molar mass is the sum of the atomic masses of all the atoms in the compound. For example, if we want to find the number of moles of water (H2O), we would calculate the molar mass of hydrogen (H) and oxygen (O), and then add them together. The molar mass of H2O is 18 g/mol.
Once we know the molar mass of a compound, we can calculate the number of moles by dividing the mass of the compound by its molar mass. For example, if we have 36 grams of water (H2O), we would divide 36 g by 18 g/mol to get 2 moles of water.
It's important to note that the number of moles of each type of atom in a compound is equal to the number of atoms of that element in 1 mole of the compound. For example, in 1 mole of water (H2O), there are 2 moles of hydrogen atoms and 1 mole of oxygen atoms.