Question

(i) The formula of urea is NH₂CONH₂ . Calculate the percentage of N in urea.
(ii) Define atomic mass unit.
(iii) What is the value of 1 atm in torr? Define atmospheric pressure.

Answer 1

Answer:

(i) Urea is a common source of nitrogen in all solid nitrogenous fertilizers and it is widely used as a nitrogen release fertilizer. The standard crop-nutrient rating (NPK rating) of urea is 46-0-0. Hence, it contains 46 % elemental nitrogen (N) 0 % elemental phosphorous (P), and 0 % elemental potassium (K).

(ii) A unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12

(iii) 1atm = 760torrs

the pressure exerted by the weight of the atmosphere is called atmospheric pressure.

Answer 2

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Atmosphere