What is the mole fraction of #NaCl# if 117 g of it is dissolved in 180 mL of water?
For this we'd use the following equation:
N meaning the grams/moles and V meaning the volume in Liters.
So first we find the molar mass of NaCl to be 58.44 grams.
we can setup this proportion to find the 'n'
Now we convert the 180 mL to L, so .180 L.
The molarity (mole fraction) is 16.83 Molar