CHEM 1&2 Lab Manual & worksheets pg 225

CHEM 1&2 Lab Manual & worksheets pg 225 -...

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Factor Label Method General Chemistry I and II Lab Manual Dakota State University page 225 of 232 Problem 2: OK. ..how about a simpler one, but one that you will need to be able to do eventually in chemistry? First a one-step calculation: The density of ethyl xanthogenic ester is 1.085 g/mL. What volume in mL would you need to get 100 g? Answer: Even if you don't know what ethyl xanthogenic ester is, or even what density is, you can solve this problem using the factor label method (which turns out to be 92.2 mL). Problem 3: Another one-step problem: If the molecular weight of the rather long-named compound 5 β -Pregnan-20
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Unformatted text preview: α-ol-3-one is 318.50 g/mol, then how many moles (abbreviated mol) would you have if you had 15.00 g? Answer: Just what is this stuff? Dunno. ..don't care, at least not for this problem. Factor label tells us the answer is 0.04710 mol. Problem 4: OK, now let's combine the two types of problems, and see how we do. If we need 0.5000 moles of 3-hexyne, which has a molecular weight of 82.15 g/mol and density of 0.7231 g/mL, what volume in mL do we need to get? Answer : Two step problem here, and one of the types of problems that tends to give students much grief. The answer is 56.80 mL. ..how'd you do?...
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This note was uploaded on 01/27/2012 for the course CHM 2045 taught by Professor Josephwalter during the Fall '11 term at Dakota State.

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