Question

Which element(s) are not balanced in this equation?

Fe2O3 + 3 CO → Fe + 3 CO2

A.
Only the Fe is unbalanced.

B.
Only the O is unbalanced

C.
Fe and O are both unbalanced.

D.
C and O are both unbalanced

Answer 1

The correct response would be A. Only the Fe is unbalanced, all of the other elements are balanced.

Answer 2

Check every element at both sides

Element      left side      right side   conclusion

Fe                2                1                not balanced
O                3+3=6          3*2=6        balanced
C                3                  3                balanced

Answer: only Fe is unbalanced (2 atoms at the left side and 1 atom at the right side)