A hot metal plate at 150°C has been placed in air at room temperature, Which event would most likely take place ove the next few minutes?
O Molecules in both the metal and the surrounding air will start moving at lower speeds,
Molecules in both the metal and the surrounding air will start moving at higher speeds,
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up,
O The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down,

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.

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the answer is 303.15 or 303