Which of the following pairs consists of molecular having the same molecular mass?

Options

A. `H_(2)O and D_(2)O`
B. `H_(2)O and HTO`
C. ` D_(2)O and HTO`
D. ` D_(2)O and HCI``

Explanation

To determine which pair of molecules has the same molecular mass, we will calculate the molecular masses of the given pairs step by step.

### Step 1: Calculate the molecular mass of H2O
- H2O consists of 2 hydrogen (H) atoms and 1 oxygen (O) atom.
- The atomic mass of hydrogen (H) is approximately 1 u, and the atomic mass of oxygen (O) is approximately 16 u.
- Therefore, the molecular mass of H2O is calculated as follows:
\[
\text{Molecular mass of H2O} = (2 \times 1) + (1 \times 16) = 2 + 16 = 18 \, \text{u}
...