January 09, 2025, 03:42:38 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: enthalpy question  (Read 5084 times)

0 Members and 1 Guest are viewing this topic.

Offline starvednsl33py

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
enthalpy question
« on: July 02, 2009, 06:57:45 AM »
the problem is:
calculate the amnt of coke (C) needed to be burned in order to heat 500 kg of water from 20C to 50C. the heat of combustion for coke is 36.15kJ/g


my questions are:
1. what is coke (C)?
2. how do i solve for the heat of combustion?

 calculated qH2O to be 62760 kJ. do i need the heat of rxn?
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27894
  • Mole Snacks: +1816/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: enthalpy question
« Reply #1 on: July 02, 2009, 07:16:45 AM »
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Phlogiston

  • Regular Member
  • ***
  • Posts: 37
  • Mole Snacks: +2/-0
Re: enthalpy question
« Reply #2 on: July 02, 2009, 09:07:18 AM »
Quote from: starvednsl33py on July 02, 2009, 06:57:45 AM
...2. how do i solve for the heat of combustion?

You are already given the heat of combustion for coke.  You are looking for an amount of coke as your final answer.  Here's how I would think of it:  how much heat do you need to raise the temperature of the water?  Then, how much coke do you need to burn in order to produce that amount of heat?

Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links