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moles from volume

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madscientist:
Hi peoples,

I know this must seem like a very easy question but im stumped for some reason.

can anyone please tell me how i can calculate  
(what formula do i use) how many moles there are in
1.00 litre of Methanol ( CH3OH).

the question im trying to answer is:

Methanol, CH3OH, is added to some automobile fuels to improve burning and reduce pollution.  What volume of O2 is consumed in the combustion of 1.00 L of methanol at 25°C and 1.00 atm?  The density of methanol is 0.791 g mL-1.
            
2CH3OH(l) + 3O2(g) ––> 2CO2(g) + 4H2O(l)

ive figured out all the other info i need but am stuck on the volume to moles part.

cheers,

Madscientist

Borek:
What is mass of 1L of methanol?

madscientist:
Would i be right to say that the answer to the questin posted would be that:

907L of oxygen (g) is consumed in the combustion of 1.0L of methanol?

hope this is right

cheers,

madscientist

Borek:
Seems OK to me.

xiankai:
according to my calculations, the figure appears to be 890L, (3 sig. fig.)

i hope u managed to calculate the correct mass of methanol...

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