1.

An electronic vacuum tube was sealed off during an experiment at a pressure of 8.2 xx 10^(-10) atm at 27^(@)C. The volume of the tube was 30 dm^(3). The number of gas molecules remaining in the tube are :

Answer»

`6.023 XX 10^(14)`
`8.2 xx 6.02 xx 10^(23)`
`24.6 xx 10^(6)`
`8.2 xx 30 xx 6.02 xx 10^(23)`

Solution :Moles of gas remaining,n`= ( pV)/( RT)`
`n = ( 8 .2 xx 10^(-10)xx 30)/( 0.082 xx 300) = 1 xx 10^(-9)`
Molecules of gas
`= 1 xx 10^(-9) xx 6.02 xx 10^(23)`
`= 6.02 xx 10^(14)`


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