Question

Exe
1. Choose the most correct option.
A. A sample of pure water, whatever the
source always contains
by
mass of oxygen and 11.1 % by mass of
hydrogen.
a. 88.9 b. 18
c. 80 d. 16
B. Which of the following compounds can​

Answer 1

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c. 80

Explanation:

100% correct answer

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Answer 2

Answer:

Mass % of oxygen in H2O = Mass of oxygen in H2OMolar mass of H2O×100⇒1618×100=88.8%. Therefore, a sample of pure water, whatever the source, always contains 88.8% by mass of oxygen and 11.1 % by mass of hydrogen. Thus, option (a) is correct.