How do you calculate the weight of the following compounds?
A)H2O2
B)C6H8O6
C)K2Cr2O7
D)C56H88O2
To calculate the weight of a compound, you need to determine the molecular weight of each element in the compound and then sum them together.
A) H2O2:
- The molecular weight of hydrogen (H) is 1 gram/mole.
- The molecular weight of oxygen (O) is 16 grams/mole.
For H2O2:
2 hydrogen atoms x 1 gram/mole = 2 grams/mole
2 oxygen atoms x 16 grams/mole = 32 grams/mole
Adding these together: 2 grams/mole + 32 grams/mole = 34 grams/mole
Therefore, the weight of H2O2 is 34 grams/mole.
B) C6H8O6:
- The molecular weight of carbon (C) is 12 grams/mole.
- The molecular weight of hydrogen (H) is 1 gram/mole.
- The molecular weight of oxygen (O) is 16 grams/mole.
For C6H8O6:
6 carbon atoms x 12 grams/mole = 72 grams/mole
8 hydrogen atoms x 1 gram/mole = 8 grams/mole
6 oxygen atoms x 16 grams/mole = 96 grams/mole
Adding these together: 72 grams/mole + 8 grams/mole + 96 grams/mole = 176 grams/mole
Therefore, the weight of C6H8O6 is 176 grams/mole.
C) K2Cr2O7:
- The molecular weight of potassium (K) is 39 grams/mole.
- The molecular weight of chromium (Cr) is 52 grams/mole.
- The molecular weight of oxygen (O) is 16 grams/mole.
For K2Cr2O7:
2 potassium atoms x 39 grams/mole = 78 grams/mole
2 chromium atoms x 52 grams/mole = 104 grams/mole
7 oxygen atoms x 16 grams/mole = 112 grams/mole
Adding these together: 78 grams/mole + 104 grams/mole + 112 grams/mole = 294 grams/mole
Therefore, the weight of K2Cr2O7 is 294 grams/mole.
D) C56H88O2:
- The molecular weight of carbon (C) is 12 grams/mole.
- The molecular weight of hydrogen (H) is 1 gram/mole.
- The molecular weight of oxygen (O) is 16 grams/mole.
For C56H88O2:
56 carbon atoms x 12 grams/mole = 672 grams/mole
88 hydrogen atoms x 1 gram/mole = 88 grams/mole
2 oxygen atoms x 16 grams/mole = 32 grams/mole
Adding these together: 672 grams/mole + 88 grams/mole + 32 grams/mole = 792 grams/mole
Therefore, the weight of C56H88O2 is 792 grams/mole.