A liquid has an enthalpy of vaporization 30 kJ/moL. At 269 is loss a. What is th

Question

A liquid has an enthalpy of vaporization 30 kJ/moL. At 269 is loss a. What is the normal boiling point of this liquid? (k = 8.314 J(K mol) 287 K 314 K 269 K 253 K 235 K Which of the following statements is/are CORRECT? Solubility is defined as the concentration of solute in equilibrium with solute in a solution. If two liquids mix to an appreciable event to form a solution they are. If two liquids mix completely in any proportion to form a solution, the solution is supersaturated. 1 only 2 only 3 only 1 and 2 2 and 3 What mass of Na_2SO_4 must be dissolved in 100.0 grams of water lower the following point by 2.50 degree C? The point depression constant, of water is -1.86 C/m. Assume the factor for Na_2SO_4 is 3.77 g 6.36 g 6.70 g 11.3 g 19.1 g What concentration unit is used in the calculation of osmotic pressure for a dilute solution? molality weight percent mass fraction mole fraction molarity

Explanation / Answer

16. Using equation,

ln(P2/P1) = dHv/R[1/T1 - 1/T2]

P1 is vapore pressure of liquid at boiling point T1

So,

ln(107/760) = 30800/8.314[1/T1 - 1/269]

T1 = 313.65 K

So boiling point is,

b. 314 K

17. True statements are,

d. 1 and 2 only

18. For freezing point,

-dTf = -iKfm

-2.50 = -2.85 x 1.86 x mass of Na2SO4/142.04 x 0.1

mass of Na2SO4 = 6.70 g

Answer : c. 6.70 g

19. Concentraton unit used for osmotic pressure measurement of dilute solutions,

e. molarity

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