Looking at the reaction below, if you started with 5.23 g of HCl and had an unlimited supply of Al, how many grams of AlCl3 should you produce?
2AI + 6HCl → 2AlCl3 + 3H2

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 !

c is the answer because when something is left after something evaporates that shows the chemical change.

am i too late?

explanation:

the product of the pressure and volume is also constant