[jms825]

We have been given a distillation experiment where 12.5 mL of methanol and 12.5 mL of distilled water were used, once for a simple distillation and once for a fractional distillation.  The lab report states that the moles of methanol and water are needed as well as the mole fraction of methanol.  He did give us the formula for density = m/v but I have no idea how to use this with the information I've been given.  We had to use 20 mL of each sample and record the temperature for each mL.  So I have the volume of methanol and distilled water and 40 temperatures; 20 for the simple distillation and 20 for the fractional.  Help please!!!

[Yggdrasil]

How grams of methanol are in 12.5mL (hint: use density)?  How many moles of methanol are in that many grams?  Repeat this process for water.