MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 12th
        
an orgnic copound contain 69.4% corbon 5.8%hydrogen sample of 0.303g of this compound was analijsed for nitrogen by kjeldonl's method .the ammonia evolved was avorbed in 50ml of 0.05M H2so4 .the exess acid required 25ml of 0.1m Naoh for neutralisation determine the molecule formula of the compound if its malecular mass is 121
2 years ago

Answers : (1)

Ashutosh Ranjan Bajpai
11 Points
							
Ammonia evolved on Kjeldhal method neutralizes some milli equivalents of H2SO4 while rest will be neutralised by NaOH.
Mill equivalents of NaOH = N.V = 0.1 x 25 = 2.5 [The charge on Na and OH is 1, therefore N = M]
Initial milli equivalents of H2SO4 = N.V  = 0.05 x 2 x 50 = 5 [The charge on H and SO4 is 2, therefore N = 2 x M]
This means milliequivalents of H2SO4 neutralised by NH3 = 5 – 2.5 = 2.5
Since ammonia is formed by nitrogen present in the organic compound, therefore milli equivalents of N = 2.5
Hence mass of Nitrogen in the compound, w = NVE/1000 = 2.5 x 14/1000 = 0.035 g
Now percentage of N in the organic compound = 0.035 x 100/0.303 = 11.55 %
Since total percentage of C, H and N is not 100 therefore rest is O (oxyegen).
Therefore C = 69.40%, H = 5.80%, N = 11.55% and O = 13.25%.
Dividing these values by respective atomic masses we get, C = 5.783, H = 5.80, N = 0.825, O = 0.828.
This on simplification gives C = 7, H = 7, N = 1 and O = 1.
Hence empirical formula is C7H7NO and empirical formula mass = 121.
Therefore molecular formula is C7H7NO and it is C6H5CONH2 that is benzamide. 
2 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 70 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details