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Topic: Energy & Disorder  (Read 5102 times)

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matthew

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Energy & Disorder
« on: May 29, 2004, 05:18:08 PM »
I have four questions that I really am not sure how to do.  I'll show what I have done so far....

1.  How much energy would one mole of HCl require to decompose?
1 mol= ?/HCl2

2.  What is the entropy change for 4Al(cr) + 3O2 ---> 2Al2O3?
205.138 + 615.414 = about 728 J/K

3.  What is the free energy change for the following reaction?
HBr(g) + NH3(g)  -----> NH4Br

4.  If 10 grams of the sugar C12H22O11 burned in a calorimeter and produced a 5.5 degree C temperature change in 1500 grams of water, what would be the heat of combustion of 1 mole of sugar?

thank you sooo much!

Donaldson Tan

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Re:Energy & Disorder
« Reply #1 on: June 03, 2004, 10:33:58 PM »
1. Check your data booklet for the bond dissociation energy for H-Cl

4. Convert 10g to no. of moles. Translate the raise in temperature to heat given out using Q = mc(dT).
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006