Question

Volume of a gas at STP is `1.12xx10^(-7)` c c. Calculate the number of molecules in it
A. (a)`3.01xx10^(20)`
B. (b)`3.0xx10^(12)`
C. (c )`3.01xx10^(23)`
D. (d)`3.0xx10^(24)`

Answer 1

Correct Answer - B
`:. 22400 c c` of gas at STP has `6xx10^(23)` molecules
`:. 1.12xx10^(-7)` of gas at STP has `(6xx10^(23)xx1.12xx10^(-7))/22400`
`=0.3xx10^(14)=3xx10^(12)`.