Question

Which of the following has maximum percentage of

nitrogen by mass?
(1)LSD : C20H25N30 (2) Phencyclidine: C17H25N
if your answer is 2 then please explain why you took 14 instead of 14×3 in LSD
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Answer 1

Answer:

Urea

Ammonium cyanide

Ammonium carbonate

Ammonium nitrate

Answer :

B

Solution :

In Urea (NH2CONH2)

% of nitrogen =2360×100=46.6%

In ammonium cyandie NH4CN,

% of nitrogen =2844×100=63.6%

In ammonium carbonate, (NH4)2CO3

% of nitrogen =2896×100=29.2%

In ammonium nitrate, (NH2)2NO3,

% of nitrogen =4298×100=42.8%

Hence, ammonium cyanide contains maximum percentage of nitrogen by mass.