c=n/v..........the same for gases? (1 Viewer)

[2006hsc]

for working out the moles of CO2 in my textbook....
they pu number of moles = volume/concentration

this doesnt work with the formulae c=n/v??

its different for gases and liquids isnt it?

 

[kazan]

no it isn't the same



c = n/v relates to the molarity of a substance


or the concentration per litre


to find the volume of a gas


its mol x 22.71 or 24.79

 

[loolee]

or to find the moles of CO2 through masses and volume

n=m/M=v/V

m & v are the known masses and volume

M is the molar mass of CO2 = [12.01 + (2x16)] = 44.01

V is the Avogadro's constant volume:
at STP (0 degrees C) = 22.71L
at (25 degrees C) = 24.79 L

And therefore, n=m/44.01 ; n = v/22.71 L or 24.79 L

If you using c=n/v to find the moles, you can just substitude the formula to =
n=c x v

c=concentration
n=moles
v=volume