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Question

The heat of combustion of gaseous ammonia is 81 kcal/mole. How much heat will be evolved in the reaction of 34 grams of ammonia with excess amount of oxygen?
  1. 40.5 kcal
  2. 60.3 kg
  3. 75.8 kcal
  4. 81 kcal
  5. 162 kcal

A
60.3 kg
B
81 kcal
C
75.8 kcal
D
40.5 kcal
E
162 kcal
Solution
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The correct option is E 162 kcal
The molar mass of ammonia is 17 g/mol.
34 grams of ammonia corresponds to 34g17g/mol=2moles.
The heat of combustion of gaseous ammonia is 81 kcal/mole.
During the reaction of 34 grams (2 moles) of ammonia with excess amount of oxygen, heat evolved will be 2mol×81kcal/mol=162kcal.

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