CHEM 1&2 Lab Manual & worksheets pg 224

CHEM 1&2 Lab Manual & worksheets pg 224 -...

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Factor Label Method General Chemistry I and II Lab Manual Dakota State University page 224 of 232 CONVERSION FACTORS: no additional conversion factors needed Notice that we have not one, but two single unit numbers (150,000 cal and 100. g). With which do we start? Well, without any further information, it's not clear, so we'll start with one of them, say 100 g, and we'll just keep going. So, let's set it up. 100 10 1 150 000 6 67 10 4 1 . * . * , . g cal g C cal x C o o = - - There are a couple of things to note about this problem. The first is that the last term is written as 1/150,000 cal. I knew I needed calories in the denominator to cancel calories in the numerator, but 150,000 calories is a single unit number. Thus, I recognize that 150,000 cal is equivalent to 150,000 cal / 1, so to get calories in the numerator, I just "flip" this number around. I did NOT add any superfluous or artificial units to the "1" in the numerator. When we write 150,000 cal in this fashion, this means that we
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