Wednesday, January 12, 2011

Last Mole Conversion... for now

Molar Volume of Gases at STP

(btw, STP = Standard Temperature & Pressure)

Gases expand and contract based on the temperature, therefore, the volume changes.

Basically, the whole lesson talks about how 1 mole of gas at STP occupies 22.4 L  ..

Sooo, let's try an example >>
                        Calculate the volume occupied by 3.4 grams of ammonia ( NH3 ) at STP..
                        Molar Mass = 17 g 
                        3.4 g  x  1 mole    =  0.2 moles
                                      17 g 

                        0.2 moles  x  22.4 L  =  4.5 L of NH3 

Simple, eh ?!!

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