When HgO is heated, it decomposes into elemental mercury and diatomic oxygen gas. If 55.2 g of Hg is obtained from 84.7 g of the mercuric oxide, what is the percent yield of the reaction

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 !

i think it is true since you can test the answer and can use observations to complete it.

he would use the colour black

all eukaryotic cell have mitochondria : )