The police found 70 grams of NaCl (salt) in the room. To kill somebody with acid, you would need at least 60 grams of HCI (acid). Is there enough salt to prove that Albert
killed the butler with acid?
HCl + NaOH → NaCl + H2O
Clue: Police found 70 grams of NaCl in the room. Convert grams of NaCl (salt) into grams
of HCl (acid) to see if there was enough acid to murder the butler.

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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 !