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 1.008 g/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)

To calculate the molar mass of a compound, you add together the masses of all the atoms that make up the compound. Here are the calculations for each of the given compounds:<br /><br />1. $H_{2}O$:<br /> - Hydrogen (H): 2 atoms × 1.008 g/mol = 2.016 g/mol<br /> - Oxygen (O): 1 atom × 15.999 g/mol = 15.999 g/mol<br /> - Total molar mass = 2.016 g/mol + 15.999 g/mol = 18.015 g/mol<br /><br />2. $KNO_{3}$:<br /> - Potassium (K): 1 atom × 39.10 g/mol = 39.10 g/mol<br /> - Nitrogen (N): 1 atom × 14.007 g/mol = 14.007 g/mol<br /> - Oxygen (O): 3 atoms × 15.999 g/mol = 997 g/mol<br /> - Total molar mass = 39.10 g/mol + 14.007 g/mol + 47.997 g/mol = 101.104 g/mol<br /><br />3. $MgSO_{4}$:<br /> - Magnesium (Mg): 1 atom × 24.305 g/mol = 24.305 g/mol<br /> - Sulfur (S): 1 atom × 32.06 g/mol = 32.06 g/mol<br /> - Oxygen (O): 4 atoms × 15.999 g/mol = 63.996 g/mol<br /> - Total molar mass = 24.305 g/mol + 32.06 g/mol + 63.996 g/mol = 120.361 g/mol<br /><br />4. $NH_{3}$:<br /> - Nitrogen (N): 1 atom × 14.007 g/mol = 14.007 g/mol<br /> - Hydrogen (H): 3 atoms × 1.008 g/mol = 3.024 g/mol<br /> - Total molar mass = 14.007 g/mol + 3.024 g/mol = 17.031 g/mol<br /><br />5. $CaCO_{3}$:<br /> - Calcium (Ca): 1 atom × 40.078 g/mol = 40.078 g/mol<br /> - Carbon (C): 1 atom × 12.011 g/mol = 12.011 g/mol<br /> - Oxygen (O): 3 atoms × 15.999 g/mol = 47.997 g/mol<br /> - Total molar mass = 40.078 g/mol + 12.011 g/mol + 47.997 g/mol = 100.086 g/mol<br /><br />6. $C_{12}H_{22}O_{11}$:<br /> - Carbon (C): 12 atoms × 12.011 g/mol = 144.132 g/mol<br /> - Hydrogen (H): 22 atoms × 1.008 g/mol = 22.176 g/mol<br /> - Oxygen (O): 11 atoms × 15.999 g/mol = 175.989 g/mol<br /> - Total molar mass = 144.132 g/mol + 22.176 g/mol + 175.989 g/mol = 342.297 g/mol<br /><br />7. $C_{3}H_{8}$:<br /> - Carbon (C): 3 atoms × 12.011 g/mol = 36.033 g/mol<br /> - Hydrogen (H): 8 atoms × 1.008 g/mol = 8.064 g/mol<br /> - Total molar mass = 36.033 g/mol + 8.064 g/mol = 44.097 g/mol<br /><br />8. NaOH:<br /> - Sodium (Na): 1 22.990 g/mol = 22.990 g/mol<br /> - Oxygen (O): 1 atom × 15.999 g/mol = 15.999 g/mol<br /> - Hydrogen (H): 1 atom × 1.008 g/mol = 1.008 g/mol<br /> - Total molar mass = 22.990 g/mol + 15.999 g/mol + 1.008 g/mol = 39.997 g/mol<br /><br />9. $Fe_{2}O_{3}$:<br /> - Iron (Fe): 2 atoms × 55.845 g/mol = 111.69 g/mol<br /> - Oxygen (O): 3 atoms × 15.999 g/mol = 47.997 g/mol<br /> - Total molar mass = 111.69 g/mol + 47.997 g/mol = 159.687 g/mol<br /><br />10. $AlPO_{4}$:<br /> - Aluminum (Al): 1 atom × 26.982 g/mol = 26.982 g/mol<br /> - Phosphorus (P): 1 atom ×