A sample of an organic compound was weighed to 0.250g and subjected to Kjeldahl treatment....
CHEMISTRY
POST UTME OAU
A sample of an organic compound was weighed to 0.250g and subjected to Kjeldahl treatment. The ammonia produced was neutralized by 27.0cm3 of 0.100 mol dm?3 HCI. What is the percentage of nitrogen in the compound? [H = 1; N = 14]
- A) 18.4%
- B) 17.8%
- C) 15.1%
- D) 13.3%
Correct Answer: C) 15.1%
Explanation
In this question, we are given the mass of the organic compound and the volume and concentration of HCl used to neutralize the ammonia produced by the Kjeldahl treatment. Our goal is to find the percentage of nitrogen in the compound.
First, we need to determine the number of moles of HCl used in the reaction. We can do this by multiplying the volume (in dm
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