If I get 1 moles of Epsom salt, which has the chemical formula MgSO4.7H2O. What is the molar mass of this compound? Molar mass of each element is provided in the periodic table.
__________ g/mol. Your answer must have two decimal places.
Then pick up your periodic table, look up the atomic weights of each. add everything together. If you don't have a periodic table you can look them up on the web.
To calculate the molar mass of a compound, we need to find the sum of the atomic masses of all the atoms in the compound. For MgSO4.7H2O:
1 mole of Mg has a molar mass of 24.31 g/mol (found on the periodic table).
1 mole of S has a molar mass of 32.07 g/mol.
4 moles of O have a combined molar mass of 15.99 g/mol x 4 = 63.96 g/mol.
7 moles of H2O have a combined molar mass of (2.02 g/mol x 2 + 16.00 g/mol) x 7 = 126.14 g/mol.
To calculate the molar mass of the whole compound, we add these values:
Molar mass of MgSO4.7H2O:
24.31 g/mol + 32.07 g/mol + 63.96 g/mol + 126.14 g/mol = 246.48 g/mol.
Therefore, the molar mass of Epsom salt (MgSO4.7H2O) is 246.48 g/mol.