What is the mole ratio between fe and fe2o3?i don’t understand!

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2 : 1

Explanation: -

To calculate the required mole ratio, the first step is writing the balanced chemical equation for the formation of Fe2O3 from Fe.

Fe reacts with oxygen to give Fe2O3.

The balanced chemical equation for this reaction is

4 Fe + 3 O 2 --> 2 Fe2O3

Now from the balanced chemical equation we see

There are 4 moles of Fe.

We also see there are 2 moles of Fe2O3.

So their ratio is Fe : Fe2O3 = 4 : 2.

Simplifying by diving by 2, we get Fe : Fe2O3 = 2 : 1

The mole ratio between Fe and Fe2O3 is 2 : 1.

i think it is d. e because the next one is igneous.

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 !