6. What is the mass percent of hydrogen in water?

11.19

Explanation:

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

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