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Caffeine has a molecular weight of 194. ...

Caffeine has a molecular weight of 194. if it contains 28.9% by mass of nitrogen. Number of atoms of nitrogen in one molecular of caffeine is:

A

4

B

6

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
Mass of nitrogen is 194 amu caffeine `=(28.9)/(100)xx194`
=56 amu
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Knowledge Check

  • Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is

    A
    4
    B
    6
    C
    2
    D
    3

  • Caffeine has a molecular weight of 194. If it contains 28.9 % by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is

    A
    (a)4
    B
    (b)6
    C
    (c )2
    D
    (d)3

  • Haemoglobin contains 0.334% of Fe by weight. The molecular weight of haemoglobin is approximately 67200. The number of Fe atoms present in one molecule of haemoglobin is

    A
    1
    B
    6
    C
    4
    D
    2

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