Volume of a gas at STP is `1.12xx10^(-7)` c c. Calculate the number of molecules in it

Options

A. `6.02 xx 10^(23)`
B. `3.01 xx 10^(12)`
C. `6.02 xx 10^(12)`
D. `3.01 xx 10^(23)`

Answer

B

Explanation

`22400` cc of a gas at `STP = 6.02 xx 10^(23)` molecules `1.2 xx 10^(-7)c c` of a gas at STP = ?
`= (1.12 xx 10^(-7) xx 6.02 xx 10^(23))/(22400) = 3.01 xx 10^(12)` molecules