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 # = 6.022 times 10^23) Sodium hydroxide is available commercially as a 40.0% by weight aqueous solution. Calculate the molality of this sodium hydroxide solution. At 80 C, pure liquid A has a vapor pressure of 100 mm Hg and pure liquid B has a vapor pressure of 940 mm Hg. What is X_A for a solution of A and B with a normal boiling point of 80 C? Calculate the freezing point of a solution of 20.0 g methyl salicylate, C_7H_6O_2, dissolved in 800. g of benzene, C_6H_6. K_f is 5.10 C/m and the freezing point is 5.50 C for benzene. What is the molar mass of sucrose (table sugar) if a solution prepared by dissolving 0.822 g of sucrose in 300.0 mL of water has an osmotic pressure (pi) of 149 mm Hg at 298 K? [pi = MRT(R, gas constant = 0.08206 L.atm/K.mol)]

Explanation / Answer

(20)

Given data,

Pressure, P = 1.0 mmHg = 1.0 mHg * 1 1tm / 760 mmHg = 0.0013 atm

Volume, V = 500 mL = 0.50 L

Temperature, T = 39 + 273.15 = 312.15 K

R = universal gas constant = 0.0821 L.atm.K-1.mol-1

n = numer of moles = ?

Using the formula,

P V = n R T
n = (0.0013 * 0.50) / (0.0821 * 312.15)

n = 0.000025 mol

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