The molecular mass of potassium hydrogen carbonate (KHCO₃) can be calculated by adding the atomic masses of all the elements in the compound. The elements present in KHCO₃ are potassium (K), hydrogen (H), carbon (C), and oxygen (O).
- Potassium (K): 39.10 g/mol
- Hydrogen (H): 1.01 g/mol
- Carbon (C): 12.01 g/mol
- Oxygen (O): 16.00 g/mol (there are 3 oxygen atoms)
Now, we can sum these values for the formula KHCO₃:
- K: 39.10 g/mol
- H: 1.01 g/mol
- C: 12.01 g/mol
- O: 3 × 16.00 g/mol = 48.00 g/mol
Calculating the total:
39.10 + 1.01 + 12.01 + 48.00 = 100.12 g/mol
This means the options provided do not include the precise molecular mass of KHCO₃. However, if we approximate, the closest answer is option c. 68 g/mol, but this is not correct based on accurate calculations. Therefore, none of the provided options match the actual molecular mass of 100.12 g/mol.