Which of the following would weight most ?

Options

A. 1 mole of `H_(2)O`
B. 1 mole of `CO_(2)`
C. 1 mole of `NH_(3)`
D. None of these

Explanation

To determine which substance weighs the most among the given options, we need to calculate the molar mass of each substance. The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol).

### Step-by-Step Solution:

1. **Calculate the molar mass of H₂O (Water)**:
- Hydrogen (H) has a molar mass of approximately 1 g/mol.
- There are 2 hydrogen atoms in H₂O, so the total mass from hydrogen is:
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