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6. What percentage of a sample of nitrogen must be allowed to escape if its temperature, pressureand volume are changed from 220°C, 3 atm and 1.65 litres, to 40°C, 0.7 atm and 1 lítrerespectivey? |
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Answer» Initial conditions: T1= 220 degree C = 493 K, P1= 3 atm, V1= 1.65 LFinal conditions: T2= 40 degree C =313 K, P2= 0.7 atm, V2= 1.00 LNow,n1= P1V1/RT1 = 3 x 1.65/R x 493 n2= P¹V¹/RT20.7 x 1/R x 313 Fraction of gas remaining, n2/n1= (0.7 x 1 x 493)/(3 x 1.65 x 313) = 345.1/1549.35 = 0.22 Fraction of gas escaped = 1-0.22 = 0.78 = 78% Thus, 78% of nitrogen gas should be allowed to escape. wrong |
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