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Question

Which of the following is an example of a molecule of an element?

A
H2O
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B
NH3
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C
CO2
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D
O2
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Solution

The correct option is D O2
O2 is a molecule made up of 2 oxygen atoms. Therefore, it is an example of a molecule of an element.

However, NH3 contains 1 N and 3 H atoms, H2O contains 2 H and 1 O atom and CO2 contains 1 C and 2 O atoms. Therefore, they are considered as molecules of compounds.

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