How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4)2S a. 2
b. 4
c. 8
d. 16

Explanation:

There are "2 parts" to the molecule S(NH₄)₂

Let's focus on the ammonium, since it contains the hydrogen.

There is 1 Nitrogen atom (no subscript) and 4 hydrogen atoms ( subscript of 4).

But, this is only for 1 molecule of ammonium. If we look back at the original molecule, there is a subscript of 2 around (NH₄). This indicates there are 2 molecules of ammonium.

There are 4 hydrogen atoms in 1 molecule. So, to find the number in 2 molecules, simply multiply 4 by 2.

There are 8 hydrogen atoms in S(NH₄)₂

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.