1. A 220. L kiln is used for vitrifying ceramics. It is currently operating at 1
ID: 514042 • Letter: 1
Question
1. A 220. L kiln is used for vitrifying ceramics. It is currently operating at 1175 C , and the pressure is 1.100 atm . How many moles of air molecules are within the confines of the kiln? Express your answer to three significant figures and include the appropriate units.
2. A 18.0 L gas cylinder has been filled with 7.40 moles of gas. You measure the pressure to be 4.80 atm . What is the temperature inside the tank? Express your answer to three significant figures and include the appropriate units
3. How many moles of gas must be forced into a 5.4 L tire to give it a gauge pressure of 34.2 psi at 29 C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.7 psi so that the total pressure in the tire is 48.9 psi . Express your answer using two significant figures.
Explanation / Answer
1) For this question we use ideal gas equation
PV=nRT
n=PV/RT
=1.10*220/0.082057*(1175+273)
=2.037 moles
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