Editor Staff asked 1 year ago
0.350 g of an organic compound gave 100 ml of nitrogen collected at 250 K temperature and 700 mm pressure. Calculate the percentage composition of nitrogen in the compound. Use Dumas method.
(a) 25.70%
(b) 35%
(c) 35.71%
(d) 36.88%
This question was addressed to me during an online interview.
Asked question is from Organic Chemistry topic in portion Organic Chemistry – Basic Principles and Technique of Chemistry – Class 11
Select the correct answer from above options
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Editor Staff answered 1 year ago
Right answer is (c) 35.71%
Easy explanation: Here, p = 700 mm; v = 100 ml; t =250 K
Volume of nitrogen at STP = p * v * 273/ 760 * t
= 700 * 100 * 273/ 760 * 250
= 100.57 ml
22,400 ml of nitrogen at STP weighs = 28 g
Then, 100.57 ml of nitrogen weighs = 28 * 100.57/22400
= 0.125 g
Therefore, percentage of nitrogen = 0.125 * 100/0.350
= 35.71%
So, percentage of nitrogen in the organic compound is 35.71%.
