A mixture sample containing 80% NaHCO3 and 20%NaCl was marketed for certain food preparations. As an analytical chemist, you took a 2.00 g of the mixture and heated it until the decomposition reaction was complete and found the final mass was 1.02 g. Based on this, calculate the percent of NaHCO3 in the mixture. Assuming 80% is the actual value, what is the percent error in your measurement?

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 !

you need to stop taking that class