Determine if the following equations are balanced or unbalanced
a. Zn + HCl----> ZnCl 2 + H 2
b. 2Na + H 2 ----> 2NaH
c. Al + Fe 2 O 3 ----> Fe + Al 2 O 3
d. MgBr 2 + Cl 2 ----> MgCl 2 + Br 2
e. C 3 H 8 + O 2 ----> H 2 O + CO 2

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