A number of compounds containing the heavier noble gases, and especially xenon,

Question

A number of compounds containing the heavier noble gases, and especially xenon, have been prepared. One of these is xenon hexafluoride (XeF6), which can be prepared by heating a mixture of xenon and fluorine gases. XeF6 is a white crystalline solid at room temperature and melts at about 325 K. A mixture of 0.0600 g of Xe and 0.0274 g of F2 is sealed into a 100.0-mL bulb. The bulb contains no air or other gases. The bulb is heated, and the reaction above goes to completion. Then, the sealed bulb is cooled back to 20.0

Explanation / Answer

moles of Xe = 0.06/131.293 =0.00045699313 mol

moles of F2 = 0.0274/38 = 0.00072105263 mol

moles of produced XeF2 = 0.00024

moles of left Xe = 0.00021

Pressure = (0.08206*0.00024*293)/(.1)   + (0.08206*0.00021*293)/(.1) = 0.10819611 atm = 0.10819611*760 = 82.2torr

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