Problem: Which of the following equations are balanced? Balance those that need it.(a) CaC2 + 2 H2O  → Ca(OH)2 + C2H2(b) C2H8N2 + 2 N2O4 → 2 N2 + 2 CO2 + 4 H2O(c) 3 MgO + 2 Fe → Fe2O3 + 3 Mg(d) N2O → N2 + O2

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Balanced reaction  same (whole number) number of atoms on both sides of equation


(a) CaC2 + 2 H2O  → Ca(OH)2 + C2H2    balanced

Reactants             Products

Ca - 1                      Ca - 1 

C - 2                        C - 2

H - 4                         H - 4

O - 2                        O - 2

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Problem Details

Which of the following equations are balanced? Balance those that need it.

(a) CaC2 + 2 H2O  → Ca(OH)2 + C2H2

(b) C2H8N2 + 2 N2O4 → 2 N2 + 2 CO2 + 4 H2O

(c) 3 MgO + 2 Fe → Fe2O3 + 3 Mg

(d) N2O → N2 + O2

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