whats up guys, ive been having problems on this h/w problem using the clausius-clapeyron equation to find the pressure of a gas.. ive gotten some of the other same types of questions correct but i keep getting the same answer and its wrong..
Diethyl ether has a DELTA H vap of 29.1 kJ/mol and a vapor pressure of .703 atm at 25 degrees Celsius. What is its vapor pressure at 55 degrees celcius..
ln P2/P1 = ( - H vap/R)(1/T2-1/T1)
= (-29100/8.314)(1/323.15 - 1/298.15)
i always get it to come out to lnP2/P1 = .908
so my final answer keeps coming to 1.74 which is off by 10%-100%
when i initially submitted the problems answer as 1.88 atm it said i was within 10 percent..
i didn't think i had a calculation error b/c ive done it like 5 times using all different ways (using torr instead of atm, converting scientific notation to very small decimal numbers, etc...) i always get to the last step where i have .908 = lnP2/P1
any ideas i should try???
thanks a whole lot