Question

Construction crews sometimes use this reaction for welding underwater structures:

Answer 1

It's 5.00 I just took it 

Answer 2

Answer:

5 moles of iron (Fe) would be produced if 2.50 mol of Fe₂O₃ reacted.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So:

$x=\frac{b*c}{a}$

The rule of three in this case is applied as follows: if 1 mole of Fe₂O₃ produces 2 moles of Fe by stoichiometry, 2.5 moles of Fe₂O₃ how many moles of Fe will it produce?

$moles of Fe=\frac{2moles of Fe*2.5 moles of Fe_{2} O_{3} }{1 moles of Fe_{2} O_{3} }$

moles of Fe= 5

5 moles of iron (Fe) would be produced if 2.50 mol of Fe₂O₃ reacted.