To calculate the molar mass of a compound, you add together the masses of all the atoms that make the compound. For example to calculate the molar mass of H_(2)O you add the mass of two hydrogen atoms to one oxygen atom. If you look on the periodic table, you will find that hydrogen's molar mass is 1.008g/mol and oxygen's molar mass is 15.999g/mol. To calculate the molar mass of H_(2)O you add (2times 1.008g/mol)+15.999g/mol for a total of 18.015g/mol. If you weigh 18 grams of water, you will have just under 6.022times 10^23 water molecules. Calculate the molar masses of the compounds below and show your work: 1. H_(2)O 6. C_(12)H_(22)O_(11) 2. KNO_(3) 7. C_(3)H_(8) 3. MgSO_(4) 8. NaOH 4. NH_(3) 9. Fe_(2)O_(3) 5. CaCO_(3) 10. AlPO_(4)

1. To calculate the molar mass of , we need to add the masses of all the atoms in the compound.The molar mass of hydrogen (H) is 1.008 g/mol, and there are two hydrogen atoms in . The molar mass of oxygen (O) is 15.999 g/mol.So, the molar mass of is: 2. The molar mass of potassium (K) is 39.10 g/mol, the molar mass of nitrogen (N) is 14.007 g/mol, and the molar mass of oxygen (O) is 999 g/mol. There are three oxygen atoms in .So, the molar mass of is: 3. The molar mass of magnesium (Mg) is 24.305 g/mol, the molar mass of sulfur (S) is 32.06 g/mol, and the molar mass of oxygen (O) is 15.999 g/mol. There are four oxygen atoms in .So, the molar mass of is: 4. The molar mass of nitrogen (N) is 14.007 g/mol, and the molar mass of hydrogen (H) is 1.008 g/mol. There are three hydrogen atoms in .So, the molar mass of is: 5. The molar mass of calcium (Ca) is 40.078 g/mololar mass (C) is 12.011 g/mol, and the molar mass of oxygen (O) is 15.999 g/mol. There are three oxygen atoms in .So, the molar mass of is: 6. The molar mass of carbon (C) is 12.011 g/mol, the molar mass of hydrogen (H) is 1.008 g/mol, and the molar mass of oxygen (O) is.999 g/mol. There are twelve carbon atoms, twenty-two hydrogen atoms, and eleven oxygen atoms in .So, the molar mass of is: 7. The molar mass of carbon (C) is 12.011 g/mol, and the molar mass of hydrogen (H) is 1.008 g/mol. There are three carbon atoms and eight hydrogen atoms in .So, the molar mass of is: 8. NaOHThe molar mass of sodium (Na