if 1.0 L of a 2.0 M solution contains 1.204 * 10^24 molecules of a solute, how many molecules of solute will 1.0 L of a 0.5 M solution contain?

The formula for molariy is nomber of moles/volume

0.5=n/1=>n=0.5 moles

one mole contains 6.023*10^23 molecules

so 0.5 contain 3.0115*10^23 molecules

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 !

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'