Chemistry
Grade-9
Easy
Question
How many molecules of CO2 are present when 5 moles of CO2 are present in the gaseous sample?
- 5 NA
- 10 NA
- 15 NA
- All of the above
Hint:
1 mole has NA molecules.
The correct answer is: 5 NA
In 1 mole of CO2 there are 
23 molecules which is also termed as Avogadro number NA.
In 5 moles of CO2 there are 
23 molecules which can also be written as 5NA in the gaseous sample.
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