chemistry help!!!!????

Question

a method of removing CO2 from a spacecraft is to allow the Co2 to react with sodium hydroxide.(THE PRODUCTS OF THE REACTION ARE SODIUM CARBONATE AND WATER)
What volume carbon dioxide at 25 degree celcius and 749 mmHg can be moved per kilogram of sodium hydroxide that reacts?
A.301 L
B. 284l
c. 276L
D.310 L
e.620l

Answer 1

This is just a mass balance problem. You need to go from moles NaOH to moles CO2. Then finish up using the gas laws since what you want is the volume of the gas, not just its mass.

As always when balancing different chemical substances, you have to go through moles. You also need a balanced equation to start with. So

Balanced equation: 2 NaOH + CO2 = Na2CO3 + H2O

This should have been easy to work out. You know from the charges that sodium carbonate is Na2CO3, so you must be using up TWO NaOH to get the two sodiums that you need.

Find out how many moles NaOH there are in a kilogram, by dividing 1,000 g by the formula weight of NaOH.

Care! The number of moles of carbon dioxide is not the same as the number of moles of NaOH. Use the balanced equation to go from one to the other.

Finally, like in pretty well all gas problems, use

PV = nRT.

You just found n, and you are told the other numbers (care again! in all these calculations, temperature has to be in degrees Kelvin), so all you need to do now is find V.

Good luck!