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21 May, 08:26

We did not find results for: c=49.98%, h=5.19%, n=28.85%, o=16.48% the molar mass of caffeine is 194.19 g/mol. find the molecular formula of caffeine

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  1. 21 May, 10:45
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    First establish that your going to measure using 1 mole

    So now you have 194.19g caffeine

    Carbon is 49.48% of the mass

    so you have (49.48%) * (194.19) = 96.0852 g carbon

    to see how many carbons you have you do (mass/Molar mass)

    (96.0852/12.0107) = 10

    So you have 10 carbons

    Do it for each one:

    Hydrogen:

    (5.19%) * (194.19) = 10.0785 g

    (mass/molar mass) (10.0785/1.00794) = 10

    Nitrogen:

    (28.85%) (194.19) = 56.0238 g

    (56.0238/14.00674) = 4

    Oxygen:

    (16.48%) (194.19) = 32.0025g

    (32.0025/15.9994) = 2

    Final formula: C8 H10 N4 O2
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