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An electric bulb of volume 250cc was sea...

An electric bulb of volume `250`cc was sealed during manufacturing at a pressure of `10^(-3)mm` of mercury at `27^(@)C`. Compute the number of air molecules contained in the bulb. Avogadro constant `=6xx10^(23)mol^(-1),` density of mercury`=13600kgm^(-3)` and `g=10ms^(-2)`.

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The correct Answer is:
`8.05xx10^(15),3.1xx10^(-7)m`
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