Question

how many oxygen molecules are present in 1 liter of air containg 80% volume of O2​

Answer 1

Answer:

CHEMISTRY

Asked on December 20, 2019 byAshafal Gopinath

How many molecules of O2 are present in 1 L air containing 80% volume of O2 at STP?

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ANSWER

Amount of oxygen in 1 litre air is =80% (1000ml)

                                                       =10080×1000=800 ml

1 mole of any gas at STP, occupies 22.4 litres

22400 ml of O2 gas contains 6.022×1023 molecules

1 ml of oxygen gas contains =224006.022×1023

800 ml contains =224006.022×1023×800=2.15×1022 molecules.

∴  molecules present in 1 litre air containing 80% volume of at STP is 2.15×1022 molecules.