Assume that a water balloon has the same number of water molecules as a helium balloon has helium atoms. If the mass of the water is 4.5 times greater than the mass of the helium, how does the mass of a water molecule compare with the mass of a helium atom? The mass of the water molecule is 4.5 time great than the helium atom

the masses are equal

The helium atom does not have mass since it is a gas

The mass of the helium atom is 4.5 times greater than the water molecule

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 !

the correct answer to this question is 2