free energy org – Gibbs Free Energy to Equilibrium Constant?
Gibbs Free Energy to Equilibrium Constant?
1.) Determine ΔG° for the following reaction:
Fe2O3(aq) + 3/2O2(g) –> 2Fe(s) + 3CO2 (g)
Use the following reactions with known ΔG°rxn values:
2Fe(s) + 3/2O2(g) –> Fe2O3(s) ______ ΔG°= -742.2 kJ
CO(g) + ½O2(g) –> CO2(g) ______ ΔG°= -257.2 kJ
2.) Copper metal is obtained by melting copper (I) sulfide ores:
Cu2S(s) + O2(g) –> 2Cu(s) + SO2(g)
Use the data in the appendix to calculate ΔSsystem, ΔSsurr, and ΔStotal at 25°C for this reaction. Is the reaction spontaneous under standard-state conditions at 25°C?
ΔSsurr=- ΔH/T. ΔSsystem is the change in entropy of the reaction being performed.
3.) Consider the evaporation of methanol at 25°C:
CH3OH(l) –> CH3OH(g)
a)Find ΔG° at 25°C
b)Find ΔG° at 25°C under the following nonstandard conditions:
i. PCH3oH= 150 mmHg
ii. PCH3oH= 100 mmHg
iii. PCH3oH= 10 mmHg
c) Explain why methanol spontaneously evaporates in open air at 25°C
4.)Consider the following reaction:
CO(g) + 2H2(g) < ---- > CH3OH(g)
Kp= 2.26 x 10^4 at 25°C
Calculate ΔG of the reaction at 25°C under each of the following conditions:
a. Standard conditions
b. At equilibrium
c. PCH3oH=1.0atm; PCO=PH2=.010atm
Ok so you might find the next few links interesting. These are from around the web, just random snippets that I’ve picked up in my reading, but I found some very cool information in them. You might too. Here goes…
510-521-6887; www.ebparks.org. Alameda Free Library — Events. End of Summer Reading Party, 6:30 pm Aug. 19; for all children who participated in the summer … Read More…
Admission is free. For information, call Karen Kelly at 851-2198 or e-mail info@TFAG.org. A rodeo sponsored by the Terrebonne Livestock Association is set … Read More…
The International Energy Agency Shills For OPEC, The Oil …
… to foster economic growth," went out of his way to pay tribute to that icon of free markets, the Organization 0f Petroleum Exporting Countries (OPEC), … Read More…
That’s all the news for today guys, so until next time, thanks for stopping by.
After A New Heating Boiler?
Selecting a substitute boiler
You could want help in choosing your next central heating boiler as this is not a transparent expense based conclusion. expense will be high on your list but you also require to think of other matters, you will require to contemplate on how much hot water your family will use, how much gas the gas boiler will burn and how much space you have to install it.
The primary heating boiler types are:-
Gas back boilers
Some households still have back boilers, these are are normally sheltered at the back of a chimney, the fire obscuring the back boiler at the back of it. Low internal water pressure is a problem in these boilers and they are now only installed as replacements, it is space-hungry and you will want to find a place to obscure this form of boiler. A substitute back boiler even so could be your best choice if you already have one.
Previously back boilers had not been economic, but the modern back boilers are more cost-efficient now, so by changing an aging back boiler, you might make a large savings on your heating bills with improved boiler efficiency.
Popular Combination heating boilers
The most popular type is now the combi heating boiler. They are efficient and small enabling them to be fitted into small spaces. Heating water direct from the cold mains removes any wait time for hot water – as a result you have unlimited hot water.
They are more cost-efficient than other types too. As they don’t store hot water there are decreased heat losses. Look out for somebody turning on all the hot water taps in your home whilst you are running a hot bath as it could temporarily turn cold.
Unvented central heating system gas fired boilers
A hot water tank is used by a central heating system gas boiler to store of water. This means that you will need an airing closet or supplementary space for the hot water storage cylinder. The installation tends to be easier and lower-cost with this form of gas fired boiler as the other central heating system parts are built in.
Getting several streams of hot water from different taps simultaneously is now manageable. You can get a good water pressure from a central heating gas boiler by installing the hot water tank high in the home.
Open ve
1000
nt system central heating boilers
an open vent gas fired boiler is the most popular type of central heating boiler. The open vent boiler requires to water tanks to be fitted in the attic, and a hot water storage cylinder in the airing closet so it uses a lot of space.
The hot water storage cylinder is supplied by one of the tanks in the attic.
Water expansion and contraction is accommodated by the second cylinder in the loft. Showers, taps and running baths can be run in any room concurrently, but be aware that if the cylinder should become cold it will take a while to reheat.
By: Al Higginson
Article Directory: http://www.articledashboard.com
David is the author of Gas Boilers Information, the web site which contains help and advice on selecting the right gas boiler. www.gas-boilers.org . Please visit for more informative articles on how to save money..
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