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A litre of dry air weighs 1.293 gram at S.T.P Find the temperature at which a litre of air will weigh one gram when the pressure is 72 cm. of mercury.

Answer» Correct Answer - `61.4^(@)C`
At STP, volume of 1 gram of dry air,
`V= (1000//1.293) c. C.
As, (PV)/(T) = (P_(1)V_(1))/(T_1)`
`:. T_(1) = (P_(1)V_(1)T)/(PV) = (72 xx 1000 xx 273)/(76 xx (1000//1.293))`
`=334.4 K = 334.4-273 = 61.4^(@)C`


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