Balanced reaction → same (whole number) number of atoms on both sides of equation
(a) CaC2 + 2 H2O → Ca(OH)2 + C2H2 → balanced
Ca - 1 Ca - 1
C - 2 C - 2
H - 4 H - 4
O - 2 O - 2
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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