Robin and alex are discussing how water molecules form when hydrogen and oxygen atoms combine. robin writes the following chemical equation to explain the formation of water.

however, alex has a different opinion and suggests that the chemical reaction can be better represented by using the equation below.

why does alex’s equation better represent the reaction?

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

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 !