Question

how many hydrogen atoms are present in 3 molecules of ammonia (nh3)? *
o there are 3 hydrogen atoms in 3 molecules of ammonia (nh3).
o there are 12 hydrogen atoms in 3 molecules of ammonia (nh3).
o there are 9 hydrogen atoms in 3 molecules of ammonia (nh3).
o there are 6 hydrogen atoms in 3 molecules of ammonia (nh3).

Explanation:

Step1: Identify hydrogen - atom count per ammonia molecule

Each ammonia ($NH_3$) molecule has 3 hydrogen atoms.

Step2: Calculate hydrogen - atom count in 3 ammonia molecules

If 1 molecule has 3 hydrogen atoms, then 3 molecules have $3\times3 = 9$ hydrogen atoms.

Answer:

There are 9 hydrogen atoms in 3 molecules of ammonia ($NH_3$).