Conversions

1. Making conversion factors
   1. Whenever we have an equality between two different units we can make a conversion factor. These factors can be multiplied by a number we wish to convert from one unit to another.
   2. 1 inch = 2.54 cm so we get two conversion factors:
   3. To convert 12.0 in to cm, we would multiply by the first conversion factor:
   4. To convert 45.8 cm to in, we would multiply by the second conversion factor:
   5. During this year we will be making frequent conversions between grams and moles.
   6. Fortunately, the molar mass gives us an equality between these two units. For all substances 1 mol = molar mass. For example, for carbon, 1 mol = 12.01g. We therefore get the two conversion factors:
   7. What is the mass of 0.438 mol of carbon?
   8. How many moles of carbon do you have if you have 2.56g of carbon?

2. For solutions, you get conversion factors from the concentration. Molarity is the same as mol/L, so you can use molarity to convert between volumes of soultion and moles of solute.
   
   
   
   
   
3. How many liters of 2.45 M solution would you need to have 0.75 mols of solute?
4. How many mols of solute would you have if you had 35.0L of a 0.65 M solution?