Answer:
NH₃
Step-by-step explanation:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
one mole of NH₃ have 3 hydrogen atoms. Thus
3 × 6.022 × 10²³ atoms
18.066 × 10²³ atoms
1.8 × 10²⁴ atoms
while all other options are incorrect because all have two hydrogen atoms.
2× 6.022 × 10²³ atoms
12.044 × 10²³ atoms
1.2 × 10²⁴ atoms