Question

when 120g of C is completely burnt in presence of O2 at 0°c & 1 atom. then find 1) amount of O2 required in kg. 2) volume of O2 required.​

Answer 1

Answer:

Explanation:

    C+O  2  ⟶CO  2  ;ΔH=−94.05kcal

                         C+  2 1 O  2

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⟶CO;ΔH=−26.41kcal

Let a mole of carbon reacts to form CO  2  and b mole of carbon reacts to form CO.

Since, only 12 g carbon; i.e., 1 mole is used up, thus,

              a+b=  12 /12  =1                                 ...(i)

Also,             a×94.05+b×26.41=75    ...(ii)

∴a=0.718,i.e.,moleofCO  2  formed

b=0.282,i.e.,moleofCOformed

Also,moleofO2  Usedforthischange=0.718+   0.282/2  =0.859

Thus,massofO  2

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used=0.859×32=27.49g