Caffeine, a stimulant in coffee and some cola drinks, is 49.47% carbon, 5.19% H, 28.8% N, 16.48% O. What is the mass of carbon contained in 37.1 g of caffeine?
a. 36.8 g
b. 1840 g
c. 24.39 g
d. 18.49 g
e.6.11 g

18.4g

Explanation:

Given parameters:

Percentage composition:

49.47%  carbon

5.19% H

28.8% N

16.48% O

Mass of caffeine   = 37.1g

Unknown:

Mass of carbon  = ?

Solution:

To find the mass of the carbon:

  Mass of carbon = percentage composition of carbon x mass of caffeine

 Mass of carbon  = 49.47% x 37.1  = 18.4g

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