Question

If 700 mL of H2 at STP contains x molecules of it, how many molecules of O2 are
present in 700 mL of it at the same temperature and pressure?

Answer 1

Answer:



Explanation:

Answer 2

Answer:

According to Avogadro's law, If 700 mL of H₂ at STP contains x molecules of it, then 700ml of O₂ also contains x molecules of oxygen.

Explanation:

According to Avogadro's law, the equal volumes of all the gases under the similar conditions of temperature and pressure contain equal number of molecules, irrespective the nature of gas.

• We know that the one mole of gas contains 6.023×10²³ molecules. As that the one mole of each gas at 273K temperature and one atmospheric pressure occupy a volume of 22.4 L.
• It means that as long as the temperature and pressure are constant, the volume of gas is directly proportional to number of molecules.
• If N is the number of molecules and V is the volume of gas (V), then:-

          V ∝ N.

In the given statement both gases have same volume which is 700ml. Therefore if 700 mL of H₂ at STP contains x molecules then 700mol of oxygen gas will have x molecules as well.

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