Answer
a. $C_2H_5OH+3O_2\Rightarrow 2CO_2+3H_2O$
b. $3Pb(NO_3)_2+2Na_3PO_4\Rightarrow Pb_3(PO_4)_2+6NaNO_3$
c. $Zn + 2HCl\Rightarrow ZnCl_2+H_2$
d. $Sr(OH)_2+2HBr\Rightarrow 2H_2O+SrBr_2$
Work Step by Step
We follow the following steps to balance a chemical equation:
1. Start by balancing the most complicated molecules.
2. Adjust other smaller atoms/compounds
3. Check that both sides are equal