need help to derive an equation

[Kevin1211]

i just need help to get this equation. then i can do the problems..

A mixture of H2 (g), 02 (g) and 2ml of h20 (l) is present in .5 L rigid container at 25C. The # of moles of h2 and the number of moles of 02 are equal.. Total pressure = 1146mm Hg. The mixture is sparked, and h2 and o2 react until one reactant is completely consumed

 

[GTaudiophile]

I hate Chemistry with a passion. Sorry I can't help you with your homework

 

[Toastedlightly]

2 H2 + 1 O2 -(heat)-> 2 H2O methinks...

Are the gas laws supposed to come into effect (I see you list volume and temp...)?

 

[Kevin1211]

^^ thats what i originally thought, but it says the number of moles of H2 and o2 are equal... does that change anything?

 

[Toastedlightly]

Originally posted by: Kevin1211
^^ thats what i originally thought, but it says the number of moles of H2 and o2 are equal...

Then the mole of H2 are the limiting reactant.

Ah, I see a PV=nRT equation for determining the number of moles, fun problem actually. What class is this for?

 

[Kevin1211]

Originally posted by: Toastedlightly
2 H2 + 1 O2 -(heat)-> 2 H2O methinks...

Are the gas laws supposed to come into effect (I see you list volume and temp...)?

yeah.. its a gas law problem

 

[ImDonly1]

nvm

 

[Kevin1211]

Originally posted by: Toastedlightly


Ah, I see a PV=nRT equation for determining the number of moles, fun problem actually. What class is this for?

AP Chemistry. yeah ill have to be using the combined gas and ideal gas law in this problem.. yeah lots of fun :roll: heh

 

[Toastedlightly]

Originally posted by: Kevin1211

Originally posted by: Toastedlightly


Ah, I see a PV=nRT equation for determining the number of moles, fun problem actually. What class is this for?

AP Chemistry. yeah ill have to be using the combined gas and ideal gas law in this problem.. yeah lots of fun :roll: heh

Hey now, I'm two years out of that stuff. If you go on into a chemistry major... be prepared for more fun. I got a 4 on the AP test

 

[Kevin1211]

ok.. another question.. heh

im trying to calc the # of moles of the reactant remaining.. i know you're suppose to use PV=nRT, but they don't give you the volume of h2 or O2 or the pressure of any of the 2 reactants. They only give you the total pressure (1146mm Hg).

 

[imported_quasi]

I just finished the gas law unit in my AP Chem class. I'm pretty sure that because the moles of O2 and H2 are equal, they exert an equal amount of pressure. Also, don't forget to subtract the vapor pressure of the H2O before dividing to find the other pressures.