10.11 (1)

# 10.11 (1) - value of the right side of the equation by half...

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Key: 11. The pressure in a balloon filled with 3 L of gas at STP is cut in half while the volume and number of moles remain constant. What is the new temperature inside the balloon? a. -136 ˚C b. 1400 K c. 0 ˚C d. 273 ˚C e. hotter than the sun f. none of the above Pressure and temperature are directly related, take a look at the ideal gas equation rearranged so only T is on one side: T = PV/nR. As you change the components on the other side of the equation what happens? If n, R, and V are all constant, as stated in the problem, then decreasing the pressure by half will decrease the
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Unformatted text preview: value of the right side of the equation by half. Since both sides are equal, it must decrease the temperature by half. We are told in the problem that conditions are at STP, which means T = 273 K, or 0 ˚C. 273K/2 = 136.5K Since 136 K is not an option, we can convert this to ˚C, and see if that is an option. We started with 0 ˚C, and reduced this number by 136K. That is the same as reducing by 136 ˚C. So the answer in ˚C is -136˚C....
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## This document was uploaded on 11/04/2011 for the course CHEM 106 at BYU.

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