Question

How many molecules pf o2 are present in 1l of air containing?

Answer 1

Explanation:

1 litre of air contains 80% [math]O_2[/math] by volume. So [math]O_2 [/math]is 0.8 L.

At STP, 1 mole of [math]O_2[/math] occupies 22.4 L. Hence , we can find how many moles occupy 0.8 L by [math]n=\frac{0.8}{22.4}= 0.0357[/math] .

1 mole contains avagadro number([math]6.023\times 10^{23}[/math]) of particles. So, 0.0357 moles contains [math]0.0357\times 6.023\times 10^{23} = 2.15\times10^{22}[/math] molecules

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