Hay estudios microbiológicos que indican, que el alcohol (Etanol), es de vital importancia para controlar la reproducción del coronavirus, indique mediante qué métodos separaría una solución de:

A. Etanol – Ácido cítrico.
B. Etanol – Bicarbonato de sodio
C. Ácido cítrico – Bicarbonato de sodio.

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

the dissolution of polymer can be thermodynamically described in 2 steps.

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the answer is 0.42 is that is an option. this question provides no info