Explanation:

- Ammonia's chemical formula is NH3.

- It contains 1 nitrogen (N) atom and 3 hydrogen (H) atoms.

- Nitrogen has an atomic mass of approximately 14 amu (atomic mass units).

- Hydrogen has an atomic mass of approximately 1 amu.

Now, looking at the options:

- Option 1: 11 : 1 - Incorrect, as total hydrogen would weigh 3, not 1.

- Option 2: 14 : 3 - Correct, as nitrogen weighs 14 and hydrogen weighs 3.

- Option 3: 11 : 3 - Incorrect, nitrogen's mass is not 11.

- Option 4: 14 : 1 - Incorrect, hydrogen's total mass would weigh 3, not 1.