Solid iodine has a vapor pressure of 1.0 mmHg at 39 degree C. How many moles of

Question

Solid iodine has a vapor pressure of 1.0 mmHg at 39 degree C. How many moles of iodine will sublime into a 500 mL flask at this temperature? The vapor pressure of ethanol is 400 mmHg at 63.5 degree C. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol, in mmHg, at 34.9 degree C? Iridium has a radius of 136 pm and crystallizes in a face-centered cubic unit cell. What is the edge length of the unit cell? An element forms a body-centered cubic crystalline substance. The edge length of the unit cell is 287 pm and the density of the crystal is 7.92 g/cm^3, Calculate the atomic weight of the substance. (Avogadro's H = 6.022 times 10^23)

Explanation / Answer

Q20

P° = 1 mm Hg, T = 39|C = 312 K

moles of I2, for V = 500 mL

apply Ideal gas law:

PV = nRT

n = PV/(RT)

R = 62.4 mm HG * L / molK

n = PV/(RT)

n = 1*0.5 / (62.4*312 ) = 0.00002568211 moles of Iodine will be present

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