Question

What is the proportion by weight of hydroge and
oxygen in water?​

Answer 1

Answer:

Thus, the ratio of Hydrogen : Oxygen is 2:16=1:8.

Explanation:

Mass percent of any element in a compound is 100 time the mass of the element divided by the total mass

Mass%element=masselementmasscompound×100%(2.10.1)

One mole of water weights 18 grams, with 2 grams being hydrogen and 16 being oxygen, so the fraction of hydrogen is 2/18 (0.1111) and the fraction oxygen is 16/18 (.8889), and note that the sum of the fractions is 1. The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11% and the mass percent oxygen is 88.89%.

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