During nitrogen estimation of an organic compound by Kjeldahl's method the ammonia evolved by 0.6 g of compound neutralised by 20ml of 1M HVl .percentage of nitrogen present in the compound is ?

Question

Answer

Calculation of Percentage of Nitrogen in Organic Compound by Kjeldahl's Method

Step 1: Calculation of moles of HCl

1 M of HCl means 1 mole of HCl in 1 liter of solution

20 ml of 1 M HCl means 0.02 L of solution and 0.02 moles of HCl

Step 2: Calculation of moles of NH3

1 mole of NH3 reacts with 1 mole of HCl

So, the moles of NH3 can be calculated as 0.02 moles of HCl

Step 3: Calculation of moles of N

1 mole of NH3 contains 1 mole of N

So, the moles of N can be calculated as 0.02 moles of NH3

Step 4: Calculation of Percentage of Nitrogen in Organic Compound

0.6 g of organic compound produces 0.02 moles of N

So, 1 g of organic compound will produce (0.02/0.6) moles of N

Percentage of Nitrogen in Organic Compound = (Moles of N produced by 1 g of organic compound) x (Molar mass of N) x 100 / (Molar mass of Organic Compound)

Therefore, by using the above formula, we can calculate the percentage of nitrogen in the organic compound.

Answer

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