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QUESTION
What is the answer to: 50g of nitrogen (N2) has a volume of _____L at STP (40L)?
By converting to moles then to litres, we get 40L
Recall that the of an element corresponds to its molar mass in grams. For nitrogen (14 AMU), 1 mole = 14g. Now since it's the nitrogen molecule, the molar mass would be 28g (2 nitrogen atoms per molecule).
- Calculate the moles of ##N_2## in 50g We divide the mass by the molar mass to get moles ##(50g)/(28gmol^-1)## = 1.78571... mol
- Now using the at STP (which is ##(22.71 L)/(mol)##), we can convert the moles of nitrogen into the volume of nitrogen. ##1.78571... mol## x ##(22.71 L)/(mol) = 40.55... L##
It seems like your answer has been rounded down to 40L
