How do you balance #C_6H_14(g) + O_2(g) -> CO_2(g) + H_2O(l)#?
Garbage in MUST equal GARBAGE out.
Is this balanced with respect to mass? Look at the left hand side. There are 6 carbon atoms, 14 hydrogens atoms, and 19 oxygen atoms. On the right hand side, there are 6 carbon atoms........ If there is not equality of mass on RHS and LHS, you know for a fact it is unbalanced.
How does energy transfer in this reaction?