3) In the combustion reaction of methane gas: CH4 (8) + O2(g) CO2 (g) + 2 H2O (8) 4.0 X 10 exp 23 molecules of CH4 was used. Determine (a) the moles of CO2 produced (b) using your answer in (a), calculate the volume of CO2 produced at STP (c) the volume of oxygen used in the reaction at STP​

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2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !