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What is the difference between oxygen …

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What is the difference between oxygen gas and dioxygen and their masses?

  • 1 answers

Payal Singh 6 years, 8 months ago

Dioxygen means O​​​​​​2 Oxygen basically exists as a diatomic gas, that is two oxygen atoms chemically combine to form an oxygen molecule which is denoted by 

O​​​​​​2 In other words, dioxygen is the elemental form of oxygen. So, if in a question only oxygen gas has been mentioned then we will consider O​​​​​​2 and take 32g as the molar mass because atomic mass of oxygen = 16u

So molecular mass of of oxygen gas (O​​​​​​2) = 2 X 16 = 32 u and hence molar mass of oxygen gas = 32g

Otherwise, if oxygen molecule is mentioned, then it is quite clear that you will consider dioxygen and take 32g as the molar mass. However, if in the question specifically oxygen atom has been mentioned, then O atoms will be considered and the molar mass will be taken as 16g, because here we are talking about oxygen atoms, and not oxygen molecules.

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