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

## Related Questions

- Math - A small truck is to be driven 300 miles on a freeway at a constant speed ...
- MATH - I am new to this site. I am not sure if my last post went thru, with my ...
- science....... - An electric bulb is marked 220v60w. An ammeter in the circuit ...
- math - A airplane crosses the Atlantic Ocean (3000 miles) with an airspeed of ...
- calculus - Find the minimum cost of producing a can that contains 1000mm^3 if ...
- phyical science - A microwave oven has a power requirement of 1235 W. A frozen ...
- Math - An airplane crosses the Atlantic Ocean (3000 miles) with an ...
- Alg I - One type of decorative ribbon regularly costs $3.59 per yard. When the ...
- 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 ...

More Related Questions