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Question

34 gm of Ammonia is decomposed to _________ gm of Nitrogen and _____ gm of Hydrogen, _____ is the ratio of hydrogen to nitrogen by mass. The options in blanks are respectively


A

28, 3 and 28:3

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B

14, 6 and 14:6

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C

14, 3 and 14:3

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D

28, 6 and 14:3

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Solution

The correct option is D

28, 6 and 14:3


34 gm of Ammonia is decomposed to 28 gm of nitrogen and 6 gm of hydrogen, 14:3 is the ratio of hydrogen to nitrogen by mass.

Atomic masses of nitrogen and hydrogen are 14, 1 respectively.

Since there are three hydrogen atoms, total mass of hydrogen atoms is 3.

So the mass ratio is (Nitrogen):(Hydrogen) = 14:3

Total mass of compound is 34.

The mass of nitrogen is 1417×34 28 gm.

The mass of hydrogen is 317×34 6 gm.


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