_ is the measure of the force of gravity pulling on an
object.
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Gravitational force

Explanation:

Gravitational force is a fundamental force with a very long-range.

This force is a relatively weak type of fundamental force of attraction that acts between all particles that have mass.

There is a school of thought that believe that its pull is mediated by gravitons.

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 !

there are two significant figures.