calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]

We are given that the atomic mass of oxygen is 16u. In a molecule of oxygen, there are two oxygen atoms and it is denoted by O2. So, the molecular mass of O2 will be 2 X 16u = 32u. Thus, the molar mass that is the mass of 6.023 X 1023 molecules of oxygen will be 32g. So

mass of 6.023 X 1023 molecules (one mole) of oxygen = 32g

mass of one molecule of oxygen = [32 / (6.023 X 1023) ]g 

= 5.313 X 10-23g

Thus, the mass of one oxygen molecule will be 5.313 X 10-23

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