Question

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

Answer 1

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_6H_14(g) + 19/2O_2(g) rarr 6CO_2(g) + 7H_2O(g)`

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:

`AgNO_3(aq) + NaCl(aq) rarr AgCl(s)darr+ NaNO_3(aq)` We could write the net ionic ionic equation for this as:

`Ag^+ + Cl^(-) rarr AgCl(s)darr` Should you do this reactionyou would observe the prepcipitate (the deposit) of a curdy white precipitate of `AgCl`.

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.