10.15 (1)

10.15 (1) - goes up. If something varies indirectly or...

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Key: 15. The number of moles of an ideal gas in a container varies. .. a. directly as the temperature and inversely (indirectly) as volume. b. inversely (indirectly) as the ideal gas constant and directly as the pressure. c. inversely (indirectly) as the pressure and directly as the volume. d. directly as the volume and inversely (indirectly) as the temperature. e. inversely as the IQ of the observer Hopefully you recognized that all of the components mentioned are contained in the ideal gas law. It would be helpful then to take a look at it: PV = nRT It is helpful in these situations to put the variable of interest, that is number of moles, on one side of the equation like so: n = PV/RT If something varies directly with another thing, that means when one thing goes up, the other
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Unformatted text preview: goes up. If something varies indirectly or inversely, that means when one goes up, the other goes down. In the above equation, when P increases, what happens to n? In order for both sides of the equation to remain equal, n would have to go up too. That means they vary directly with one another. What happens when T increases? Since T is on the bottom of the fraction, it would decrease the right side of the equation, so n would have to decrease to keep both sides equal. This is an inverse relationship. The only one that makes sense is answer d. Answer b might seem correct at first, but remember that R is a constant, and cannot vary!...
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This document was uploaded on 11/04/2011 for the course CHEM 106 at BYU.

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