Chemistry, 10.10.2019 04:00 jtroutt74

Construction crews sometimes use this reaction for welding underwater structures:

fe2o3 + 2al → al2o3 + 2fe

how many moles of iron (fe) would be produced if 2.50 mol fe2o3 react? make sure to use the correct number of significant figures in your answer.

2.50 mol fe2o3 =

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Answer from: leannhb3162

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.

Answer from: Quest

most sediment washes or falls into the river as a result of mass movement and runoff. other sediment eroded from the bottom or sides of the river.

What causes most sediment to wash or fall into a river

Answer from: Quest

n2(g) + 3h2-> 2nh3(g) this is the balanced equation

note the mole ratio between n2, h2 and nh3. it is 1 : 3 : 2 this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note: the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

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Construction crews sometimes use this reaction for welding underwater structures:

fe2o3...