4C.7

RRahimtoola1I
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

4C.7

How do you do this problem? I was using q = nH and q = mH but I am not getting the correct answer.

"(a)Atitsboilingpoint,thevaporizationof0.579molCH4(l) requires 4.76 kJ of heat. What is the enthalpy of vaporization of methane? (b) An electric heater was immersed in a flask of boiling ethanol, C2H5OH, and 22.45 g of ethanol was vaporized when 21.2 kJ of energy was supplied. What is the enthalpy of vaporiza- tion of ethanol?"

Jessica Booth 2F
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

Re: 4C.7

You should be able to use q=n$\Delta H$. For part a) $\Delta H$ = 4.76 KJ/ .579 mol = 8.22 KJ/mol. Part b is the same except you need to convert the mass given into moles using the molar mass.