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Draw a correct Lewis structure for XeI2 (Xe in middle, surrounded by I's ) that puts a 0 formal charge on all atoms. How many lone pairs (unshared pairs) are on the central atom? --------------------------------------------------------------------------------------------------------------------------------------------------- 2) A 0.3876 gram sample of a gaseous compound occupies 142 mL at 150 degrees C and 775 torr. What is the molar mass of the compound? Assume ideal behavior. M = dRT/P M = molar mass Hint: you must convert torr to atm 760 torr = 1 atm Hint: you must convert oC to K by adding 273 Hint: you must convert mL to L

Answer :

On the Xenon atom (Xe) and both of the Iodine atoms, there are three lone pairs and the molar mass of sample is 86.83g/mole..

(a) The central Xenon atom (Xe) of the XeI2 Lewis structure is surrounded by two Iodine atoms. The Xenon atom (Xe) and each iodine atom are connected by two single bonds.

(b) Given that a gaseous sample's mass(m) is 0.3876 grams.

This sample's volume (v) is 142 ml, = 0.142 L, and its temperature (t) is 150 °C, = 150 + 273 , = 423 K

pressure (p) equals 1.09174 atm or 775 torr.

As a result of the equation pv = nRt, n=m/M and M = mRt/pv, which equals 0.3876x0.0821x423/1.0917x0.142, = 13.46068908/0.1550214, = 86.83g/mole.

The resulting molar mass is 86.83g/mole.

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