Balance following chemical equation by hit & trial method.
A. Mg3N2 + H2O → Mg(OH)2 + NH3
B. C3H8 + O2 → CO2 + H2O
C. K2Cr2O7 + H2SO4 → K2SO4 + Cr2(SO4)3 + H2O + O2
D. KMnO4 + HCl → KCl + MnCl2 + H2O + Cl2
E. FeS2 + O2 → Fe2O3 + SO2
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can you tell me the method from your textbooks
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