Which event triggers the start of black hole formation? A. The gravitational forces acting on a massive star decline rapidly.
B. A supernova blows a massive star apart.
C. A massive star depletes its stores of hydrogen and helium
D. Radiation emitted by a massive star increases

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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 !

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.