Help with calculating molarity?

Well, what you do is you convert the m amounts of your solute (for a. it would be ethanol) to molar amounts. To do this, divide the number of grams given by the molar m of the solute. You'll have to look at a periodic table to calculate molar m. For example, ethanol has a molar m of 46.02 g/mol. After calculating the molar amount of ethanol, you'll find that it is 0.760539 moles. Molarity is expressed as moles of solute per liter of solution, so you also must convert your milliliter volume of solution to liters. This is 0.545 L. Divide moles of solute by liters of solution to find 1.39548 M, or 1.40 M, expressed in the proper number of significant figures.