The number of molecules and moles in litres of at STP are respectively:

Question

The number of molecules and moles in  litres of  at STP are respectively:

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Strategy:
 According to the modern IUPAC standard, STP is defined at  pressure, where the molar volume of an ideal gas is . Use this value to find the moles, and then multiply by Avogadro's number for molecules.

Step 1: Calculate moles of } \ce{O2}
Using the STP molar volume of :

Step 2: Calculate number of molecules

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