Which chemical equation is unbalanced?
A$C + O _2 \rightarrow CO _2$
B$Sr + O _2 \rightarrow 2 SrO$
C$6 H _2+3 O _2 \rightarrow 6 H _2 O$
D$H _2+ H _2+ O _2 \rightarrow H _2 O + H _2 O$
A$C + O _2 \rightarrow CO _2$
B$Sr + O _2 \rightarrow 2 SrO$
C$6 H _2+3 O _2 \rightarrow 6 H _2 O$
D$H _2+ H _2+ O _2 \rightarrow H _2 O + H _2 O$