textbook problem 4D.15

Moderators: Chem_Mod, Chem_Admin

Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

textbook problem 4D.15

Postby Katie Bart 1I » Tue Feb 04, 2020 9:55 pm

In this problem, where do you obtain the information you need in order to write the three different balanced equations that are written in the solutions manual?

Skyllar Kuppinger 1F
Posts: 52
Joined: Thu Jul 25, 2019 12:16 am

Re: textbook problem 4D.15

Postby Skyllar Kuppinger 1F » Tue Feb 04, 2020 10:11 pm

Those are combustion equations. The combustion of a hydrocarbon is: the hydrocarbon + oxygen = water + carbon dioxide. The combustion of just hydrogen is hydrogen + oxygen = water. So you write those combustion equations and balance them by putting the right coefficients in front of each molecule.

Caitlyn Tran 2E
Posts: 100
Joined: Fri Aug 09, 2019 12:15 am

Re: textbook problem 4D.15

Postby Caitlyn Tran 2E » Tue Feb 04, 2020 10:12 pm

In this problem, they give you the enthalpy for the combustion of three different compounds. In combustion, you know that the compound will react with oxygen to produce carbon dioxide and water vapor. Once you balance them, this is how you get the three equations. From there, you can use Hess's Law to solve the problem. Hope this helps!

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 3 guests