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Question
The number of molecules in 22.4 cm3 of nitrogen gas at STP is ______.
Options
6.022 × 1020
6.022 × 1023
22.4 × 1020
22.4 × 1023
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Solution
The number of molecules in 22.4 cm3 of nitrogen gas at STP is 6.022 × 1020.
Explanation:
There are 6.022 × 1023 molecules present in 22400 cm3 of gas = 22.4 L ...`(∵1 "L" = 1/1000 "cm"^3)`
The no. of molecules present in 22.4 cm3 = `(6.022 xx 10^23 xx 22.4 "cm"^3)/(22400 "cm"^3)`
= 6.022 × 1020
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