What is the difference between oxygen …
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Posted by Neetu Singh 6 years, 8 months ago
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Payal Singh 6 years, 8 months ago
Dioxygen means O2 Oxygen basically exists as a diatomic gas, that is two oxygen atoms chemically combine to form an oxygen molecule which is denoted by
O2 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 O2 and take 32g as the molar mass because atomic mass of oxygen = 16u
So molecular mass of of oxygen gas (O2) = 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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