Hi i have 5 mins to complete this please help... Take a look at this equation: Fe2O3(s) + 3 H2(g) → Fe + 3 H2O (g)
What is not balanced in this equation?
A: The H20 is not balanced:
B: Trick Question: It's balanced.
C: The Fe is not balanced
D: The Fe2O3 is not balanced.
E: The H2 is not balanced.

C: The Fe is not balanced

Explanation:

The reaction expression is given as:

          Fe₂O₃   +   3H₂  →  Fe  +  3H₂O

The problem here is to find the specie that is not balanced.

                                                        Number of moles

Specie                               Reactant                                      Product

Fe                                              2                                                 1

O                                               3                                                3

H                                                6                                                6      

So, we see that Fe is not balanced.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)