Question

caffiene has a molecular mass of 194 if it contains 28.9 % by mass of nitrogen , number of atoms of hydrogen in one molecule of caffeine is :

a:) 4

B:)6

c:) 2

d:)3

Answer 1

answer :-

option ( a)


let there are x atoms of N


=. % of N = 28 .9

=. > x × 14 / 194 × 100

=. > x = 4


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Answer 2

hey.. your answer is option A ....4