The enthalpy of combustion for octane (C3H18(1), a key component of gasoline, is -5074 kJ/mol. The reaction equation is: C3H18(1) + 12.502(g) → 8CO2(g) + 9H20(g).
What is the AHe for this reaction?
16CO2(g) + 18H2O(g) → 2C8H18(1) + 2502(g)
| kJ

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72

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