For the hydrochloric acid at 60 °C the student had collected 30 cm3 after 15 seconds. of gas
Calculate the average rate of reaction from 0 to 15 seconds.
Rate of reaction =
cm per second

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 !

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

i don't know people like to fight everywhere rip.