Saturday
October 25, 2014

Homework Help: Chemistry

Posted by Liliana on Tuesday, November 14, 2006 at 9:24pm.

Assume electricity cost 15 cents kw per hour....using the energy requirements.what is the per gram cost of energy to produce Na + AL?

Useful info: 2NaCL --> 2Na + CL2

around 600 degree C; 14 KJ per g Na.

Al-
2Al2O3-->4Al+3O2
1000 degrees C; 30 KJ per g Al
in cryalite (Na3AlF6) so can be liquid below Tm~2000 degrees C

The 15 cents you quoted would be per kilowatt-hour, not per kw/hour. Energy is the product of power and time.

For Na, if you need 14,000 J of electricity to make 1 gram, then make the conversions 14,000 J = 14,000 Watt-second= 14 kw-second = 14/3600 kw-hour = 0.00389 kw-hour

The cost would be 15 cents/kwh x 0.00389 kwh = 0.058 cents

Do the aluminum question the same way.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

phyical science - A microwave oven has a power requirement of 1235 W. A frozen ...
physics - An energy-efficient lightbulb, taking in 25.0 W of power, can produce ...
Physics - At 7.65 cents per kilowatt-hour, what does it cost to operate a 10.0 ...
Science asap!!! - This question is about energy efficiency. e.g. more efficient ...
Math - A small truck is to be driven 300 miles on a freeway at a constant speed ...
Physics/Chemistry - If the price of electrical energy is $0.10 per kilowatt*hour...
Alg I - One type of decorative ribbon regularly costs $3.59 per yard. When the ...
Physics - electricity - An incandescent lamp is marked '120v,75W' a)what is the ...
Physics - Jemima is sanding some floorboards with an electric sander which has a...
physics - If electrical energy cost 5.00 per kilowatt hour, what will be the ...

Search
Members