Question

4Cr+3O2->2Cr2O3
How many moles of O2 react with 4.55 moles of Cr?

Answer 1

3.4125 mole O₂

Step-by-step explanation:

Data Given:

Mole of Cr = 4.55 mole

Mole of O₂ = to be calculated

4Cr + 3O₂------------> 2Cr₂O₃

from the above reaction data obtained:

4Cr + 3O₂ ------------> 2Cr₂O₃

4mole 3mole 2moles

The above reaction show that

4 mole of the Cr combine with 3 mole of O₂ and produce 2 moles of Cr₂O₃

in other words

4 mole of the Cr ≅ 3 mole of O₂

apply the unity formula

4 mole of the Cr ≅ 3 mole of O₂

4.55 mole of the Cr ≅ X mole of O₂

so by cross multiplication

4 mole of Cr x X mole of O₂ ≅ 3 mole of O₂ x 4.55 mole of the Cr

we have to find moles of O₂ ....so by rearrangement of the above equation

X mole of O₂ = 3 mole x 4.55 mole

4 mole

X mole of O₂ = 3.4125 mole

So

4.55 mole of Cr will react with 3.4125 mole O₂