Is Ca(CIO3)2 = CaCl2 + 30, a redox reaction or not?

A redox reaction occurs

Given

Reaction

Ca(ClO3)2 → CaCl2 + 3O2

Required

Type of reaction

Solution

The reaction equation is said to be a redox reaction if there is an oxidation reaction (increase in oxidation number) and a reduction reaction (decrease in oxidation number)

Oxidation number of Cl in Ca(ClO3)2 :+5

Oxidation number of Cl in CaCl2 = -1

Reduction : +5 to -1

O in Ca(ClO3)2 : -2

O in O2 : 0

Oxidation : -2 to 0

So there is a reduction and oxidation reaction

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g