Question

how many litres how many numbers of O2 molecules are present in 3 litres of O2 at ntp​

Answer 1

see attachment ........

Answer 2

Explanation:

How many number of oxygen molecules are present in 3 litres of CO2 at STP?

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Fortunately, Count Amadeo Carlo Avogadro (1776 – 1856) provided us with Avogadro’s Number, which is the number of molecules contained in 1mol of a substance at STP.

This number is 6.022x10^23.

Furthermore, 1mol of a gas at STP occupies 22.4L

So we have 3L = 3/22.4 = 0.133929mol of CO2.

Therefore, we have 0.133929 x 6.022x10^23 = 8.065x10^24 molecules of CO2,

which means that we have 8.065x10^24 atoms of carbon and twice that number of oxygen atoms.

But you asked for the number of oxygen molecules (O2), so the answer is

8.065x10^24 molecules of oxygen.