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5 February, 01:01

What percentage composition of Oxygen is H2O

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Answers (2)
  1. 5 February, 01:13
    0
    Since water is

    H

    2

    O

    (molar mass is

    18.015 g/mol

    ), it implies we have a percent composition of

    H

    and one for

    O

    .

    Given that chemical formula, we have two equivalents of

    H

    , for which we can use its molar mass,

    M

    H

    =

    1.0079 g/mol

    . We also have one equivalent of

    O

    , for which we can use its molar mass,

    M

    O

    =

    15.999 g/mol

    .

    The percent composition (by mass) of

    H

    is written in terms of a unified ratio of the molar masses is

    %

    H

    =

    2

    *

    M

    H

    M

    H

    2

    O

    *

    100

    %

    =

    2

    *

    1.0079 g/mol

    18.015 g/mol

    *

    100

    %



    11.19

    %

    H

    Similarly for

    O

    , we have

    %

    O

    =

    1

    *

    M

    O

    M

    H

    2

    O

    *

    100

    %

    =

    15.999 g/mol

    18.015 g/mol

    *

    100

    %



    88.81

    %

    O

    Thus, the percent composition of water, by mass, is

    11.19

    %

    hydrogen and

    88.81

    %

    oxygen.
  2. 5 February, 01:16
    0
    33.333% continued. In water the ratio is 2 H for every 1 O therefor the answer is 1/3 aka 33.333% continued.
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