5. Balance the following chemical equations.
(a) H2+ N2 + NH3
(b) NaOH + H2SO4 → Na2SO4 + H2O
(c) Zn +HCI → ZnCl2+ H2
(d) Na2SO3 +BaCl2 → BaSO3 + NaCl
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4H2+3N2 =2NH3
4NaOH+2H2SO4 =2Na2SO4+4H2O
Zn+2HCl= ZnCl2+H2
Na2SO3+BaCl2=BaSO3+2NaCl
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