Question

Briefly explain the principle and reactions (if any), to determine % of Carbon' in coal.
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Answer 1

Answer:

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Answer 2

We can determine the % of carbon in coal, in the following way -

• Assume that, X gram coal is burnt in air to form CO2 and H2O vapour.

C+O2 ---> CO2 2H + ½ O2 ---> H2O

• The produced CO2 and H2O passed through the previously weighed KOH solution and anhydrous CaCl2.
• Now, suppose the weight of CO2 is Y

C + O2 --->CO2

12 32 44

So,

44 grams of CO2 contains = 12 grams Carbon

Y grams of CO2 contains = 12/44 × Y grams of Carbon

Hence, % of C = 12/44 × Y × 100/X

• This is a combined determination process of carbon and hydrogen in coal. While weighing the CO2, we can also weigh the H2O vapour also, which can be used to do other calculations for calculating the % of H in the coal sample.