Consider the following reversible reaction.
2H2O(g) + 2H2(9)+O2(g)

Keq = [H2]^2[O2]

Explanation:

Keq = ([H2]^2[O2])/[H2O], but as long as [H2O] in a chemical eq is considered 1, the final Keq = [H2]^2[O2]

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.