When 100 Gallons of water is converted to hydrogen and oxygen, what energy released when burned back to water?

Question

The 100 gallons of water is distilled, is at room temperature, is closed off from the atmosphere, and is purged of disolved O2 and CO2 gases. It is then converted to hydrogen (H2) and Oxygen (O2) with electrolysis. The hydrogen and oxygen gases are then allowed to return to room temperature and are held in containers that are large enough to hold the gases at atmospheric pressure (15psi). I know that the hydrogen tank will have to be twice as big as the oxygen tank. I then have two questions. 1st, how big are the hydrogen and oxygen tanks in cubic feet? And 2nd, if the hydrogen and oxygen are burned, the heat removed, and then condensed back into the original water tank to room temperature in a system closed off from the atmosphere, what is the amount of energy in joules? Another words how much chemical energy was stored in the seperated hydrogen and oxygen? I am sorry for the english units in this problem. I am ignoring the energy required for electrolysis. Thanks for help.

Answer 1

Saying that you are ignoring the energy required for electrolysis is ironic since that is exactly what you are looking for. The magnitude of the change in gibb's free energy is the same for a reaction whether it is going forward say 2H20--> 02 + 2H2 or backward, say 02 + 2H2-->2H20, it just changes sign. You can look up the data needed to find the actual value in a chemistry book. As for the volume, use the number of liberated gas molecules in the ideal gas law PV=NkT, or using moles PV=nRT if that's easier for you.

Answer 2

I cannot say about the energy released ,it depends upon the delta H value u would be given... but the energy to seperate water into O2 and H2O is the same if done in an isothermal condition. use the value of n put in PV=nRT get v

Answer 3

the effects of international warming includes elevating the temperature on earth. as a effect of this raised temperature, the polar ice caps melting cost will strengthen, which in turn will strengthen the sea point.. this in turn will effect in lots of islands, international places or perhaps cities to grow to be swamped below water. It additionally impacts the tides globally which impacts issues which incorporate fish migration as an occasion - this has bypass on effects for the international's environment (our food and water source).. given the international's inhabitants is likewise increasing.. and we are eating our materials at an alarming cost (considering that 1950 we've ate up greater of the earth's organic materials and contaminated the earth greater desirable than in the finished history of humanity earlier) changing the water to hydrogen or oxygen does not handle the concern of international warming. it is likewise no longer much less costly or hassle-free to realize this on a international scale.