How do I calculate the molar mass of the following:
Na2SO4.10 H2O(s)
CaSO4.2H2O(s)
2*Na + S + 4*O + 10*H2O
.055G
To calculate the molar mass of a compound, you need to find the sum of the atomic masses of all the atoms in the compound. Here's how you can calculate the molar masses of Na2SO4.10H2O(s) and CaSO4.2H2O(s):
1. Na2SO4.10H2O(s):
- First, let's calculate the molar mass of Na2SO4. For this, you need the atomic masses of sodium (Na), sulfur (S), and oxygen (O). The atomic mass of Na is 22.99 grams/mole, the atomic mass of S is 32.07 grams/mole, and the atomic mass of O is 16.00 grams/mole. Since you have two sodium atoms, you multiply the atomic mass of Na by 2. Then, sum up the atomic masses of all the atoms in Na2SO4: (2 x Na) + S + (4 x O).
- Next, let's calculate the molar mass of H2O. The atomic mass of hydrogen (H) is 1.01 grams/mole, and the atomic mass of oxygen (O) is 16.00 grams/mole. Since you have ten water molecules (H2O), multiply the atomic mass of H2O by 10: 10 x (2 x H + O).
- Now add the molar masses of Na2SO4 and 10H2O together to get the molar mass of Na2SO4.10H2O.
2. CaSO4.2H2O(s):
- First, let's calculate the molar mass of CaSO4. For this, you need the atomic masses of calcium (Ca), sulfur (S), and oxygen (O). The atomic mass of Ca is 40.08 grams/mole, the atomic mass of S is 32.07 grams/mole, and the atomic mass of O is 16.00 grams/mole. Sum up the atomic masses of all the atoms in CaSO4: Ca + S + (4 x O).
- Next, let's calculate the molar mass of H2O. The atomic mass of hydrogen (H) is 1.01 grams/mole, and the atomic mass of oxygen (O) is 16.00 grams/mole. Since you have two water molecules (H2O), multiply the atomic mass of H2O by 2: 2 x (2 x H + O).
- Now add the molar masses of CaSO4 and 2H2O together to get the molar mass of CaSO4.2H2O.
Remember to use the periodic table to find the atomic masses of the elements needed.