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How many molecule are present in one mL ...

How many molecule are present in one `mL` of water vapour of `STP` ?

A

`1.69 times 10^(19)`

B

`2.69 times 10^(-19)`

C

`1.69 times 10^(-19)`

D

`2.69 times 10^(19)`

Text Solution

Verified by Experts

The correct Answer is:
d
22.4 litre water vapour at STP has
`=6.023 times 10^(23)` molecules
`therefore 1 times 10^(-3)` litre water vapours at STP has
`=(6.023 times 10^(23))/22.4 times 10^(-3)=2.69 times 10^(+19)`
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