Question #648a7

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Question #648a7

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Answer 1 · 2018-01-10T12:15:36

Either $1.5 \cdot 10^{23}$ $1.5 * 10^23$ $atoms of oxygen$ $"atoms of oxygen"$ , or $1.5 \cdot 10^{23}$ $1.5 * 10^23$ $molecules of oxygen gas$ $"molecules of oxygen gas"$ .

Explanation:

If there are 0.25 moles of oxygen atoms:
One mole of anything is $6.022 \cdot 10^{23}$ $6.022*10^23$ items of that thing.

The same applies for oxygen atoms! :)
And, if one mole of oxygen is $6.022 \cdot 10^{23}$ $6.022*10^23$ atoms, then $0.25$ $0.25$ moles is:

$0.25 \cdot (6.022 \cdot 10^{23}) = 1.5 \cdot 10^{23}$ $0.25*(6.022*10^23)=1.5 * 10^23$ $atoms$ $"atoms"$ .

If there are 0.25 moles of oxygen gas, or $O_{2}$ $O_2$ :
Similarly, if one mole of oxygen gas ( $O_{2}$ $O_2$ ) is $6.022 \cdot 10^{23}$ $6.022*10^23$ molecules, then $0.25$ $0.25$ moles is $1.5 \cdot 10^{23}$ $1.5 * 10^23$ $molecules$ $"molecules"$ .

This means there are $2 \cdot (1.5 \cdot 10^{23}) = 3.0 \cdot 10^{23}$ $2*(1.5 * 10^23)=3.0*10^23$ $atoms$ $"atoms"$ of oxygen.

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Question #648a7

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