# How do we represent the combustion of hexanes? And how do we represent the formation of silver chloride from sodium chloride, and silver nitrate?

Nov 14, 2015

Please give your science teacher a break. She might be my colleague!

#### Explanation:

So, you have to balance 2 unspecified equations. I'll give you 2, which might or not be suitable. Firstly, combustion of hexane (the which drives your motor!):

${C}_{6} {H}_{14} \left(g\right) + \frac{19}{2} {O}_{2} \left(g\right) \rightarrow 6 C {O}_{2} \left(g\right) + 7 {H}_{2} O \left(g\right)$

Is this balanced? And remember that I might be trying to bust your balls because you offered disrespect to your science teacher.

Secondly, precipitation of an insoluble precipitate, say silver chloride:

$A g N {O}_{3} \left(a q\right) + N a C l \left(a q\right) \rightarrow A g C l \left(s\right) \downarrow + N a N {O}_{3} \left(a q\right)$ We could write the net ionic ionic equation for this as:

$A {g}^{+} + C {l}^{-} \rightarrow A g C l \left(s\right) \downarrow$ Should you do this reactionyou would observe the prepcipitate (the deposit) of a curdy white precipitate of $A g C l$.

Both reaction demonstrate stoichiometry; that is for every reactant particle there must be a corresponding product particle. You also practise stoichiometry whenever you make a purchase with cash or make an electronic transaction: for every credit there must be a corresponding debit.