You may wish to review the Laws of Thermochemistry and Endothermic and Exothermic Reactions before you begin. A table of single bond energies should be used as a help (available in most general chemistry text books).
Estimate the change in enthalpy, DH, for the following reaction:
To work this problem, think of the reaction in terms of simple steps:
1.
First, the reactant molecules, H2 and Cl2, break down into their atoms
H2(g) --> 2 H(g)
Cl2(g) --> 2 Cl(g)
2. Next, these atoms combine to form HCl molecules
2 H(g) + 2 Cl(g) --> 2 HCl(g) ...
$2.19
See Also This Related BrainMass Solution
Thermodynamics: Enthalpy and Entropy
1. Given that a formation of a bond between two atoms is exothermic and accompanied by an entropy decrease, explain why all chemical compounds decompose into individual atoms if heated to a high enough temperature.
2. Is the dissolution of urea driven by enthalpy or entropy? How do you know this? Give one example of each of a process that is driven by enthalpy, and one that is driven by entropy.
... Give one example of each of a process that ... Question 1 The Gibb's free energy equation related to enthalpy ... In the case of decomposition or bond-breaking which ...
... structures of various compounds and how to calculate enthalpy of a ... A simple example would me methanol, which has one ... Remember that H makes one bond, C makes 4 ...
Bonding and Molecule Formation: Lattice Energy and Enthalpy. A sample of solid monoprotic acid with molar mass equal ...Calculate the mass in grams of acid to be ...
... For example, iodine (I) atom has 7 valence electrons (V ... and 10 bonded electrons (B) that covalently bonds with five ... have to do this kind of calculation for each ...
... 1 kcal/mol for the examples above ... to maximize binding affinity, hydrogen bonds must be ...energy parameterization derived from accessible surface area calculations. ...
... for n, and you will be able to calculate the number ... that to the number of moles in your sample. ... dipole-dipole interactions but also hydrogen bonding (higher in ...
... For example, if the rate law is k[A][C ... temperature from 25.0 ∘ C to 35.0 ∘ C . Calculate the value ... some collisions do not break the important bonds in the ...
... seem to grasp the components of the free energy equation dG=dH ... From these example we also see that a to make ... Do other ionic bonds form?) we can not say anything ...
... In the electrostatic model for "ionic bonding" U is proportional ... phenomena described in problem 3. This requires calculations of LFSE; example problem 20.3 ...
... finding any mathematical explanation as for example a general ... Rate Equation: Rate = kr[RX][Base] Rate = kr[RX ... will be much more than if bond breaking and ...
