We’re being asked to balance the given equations.
Recall that when balancing chemical equations, we have to make sure that the number of elements on both sides is equal with the lowest whole number coefficients.
____ CuO + ___NH3 → ___ N2 + ___ Cu + ___ H2O
17. ___ CuO + ___NH3 → ___ N2 + ___ Cu + ___ H2O
18. ___ C2H5OH + ___ O2 → ___ CO2 + ___ H2O
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