1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Determining Liters of ethane burned to convert H20 to steam

  1. Jun 4, 2015 #1
    1. The problem statement, all variables and given/known data
    The Heat of combustion of Ethane is 373 kcal/mole. Assuming that 60% of the heat is useful , how many liters of ethane,, measured at standard temperature and pressure, must be burned to convert 50.0kg of water ar 10.0C to steam at 100.0C? One mole of a gas occupies 22.4 liters at precisely 0C and 1atm.

    2. Relevant equations
    PV=nRT Q=mcΔT

    3. The attempt at a solution
    Qburned=Q heat up

    =mL + mcΔT

    540g/C(50g)+ 50(1cal/gC)(100-10)
    Q=31500 cal

    n= Q/heat of combustion(60%)


    V=3193680 L

    The book has it at 315000. Is there something wrong here? I feel like im missing a term or left something out???
  2. jcsd
  3. Jun 5, 2015 #2


    User Avatar

    Staff: Mentor

    You calculated Qburned per 50 grams. Did you convert this to per 50 kg somewhere?
  4. Jun 5, 2015 #3
    Why use PV=nRT when you're given 22.4 L/mol?
  5. Jun 5, 2015 #4
    Ahh that's where the error comes from. I forgot that it is per mole
  6. Jun 5, 2015 #5
    I did I believe. It should be in my note pad
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Determining Liters of ethane burned to convert H20 to steam
  1. Water vs Steam burn (Replies: 4)