Which physical property decreases with an increase in intermolecular molecular f

Question

Which physical property decreases with an increase in intermolecular molecular forces? (A) boiling point (B) enthalpy of vaporization (C) vapor pressure (D) viscosity A 0.180 g sample of liquid H_2 O is injected into a 5.00 L flask at 25 degree C. What will be present in the flask when equilibrium is established? (Vapor pressure H_2 O at 25 degree C = 23.8 mm Hg) (A) H_2 O vapor at a pressure of 186 mm Hg (B) H_2 O vapor at a pressure of 37.2 mm Hg (C) Liquid H_2 O and H_2 O vapor at a pressure of 37.2 mm Hg (D) liquid H_2 O and H_2 O vapor at a pressure of 23.8 mm Hg The atmospheric pressure on the summit of Mt. Everest is 0.333 atmospheres. At what temperature (in degree C) does H_2 O boil there? (Delta H_ H_2 O = 40.7 KJ middot mol^-1) (A) 71 degree C (B) 87 degree C (C) 96 degree C (D) 98 degree C The arrangement of ions in a solid is best investigated by means of (A) infrared spectroscopy. (B) mass spectroscopy (C) UV-visible spectroscopy (D) x-ray crystallography. Benzene and toluene form an ideal solution. The vapor pressure of benzene at 55 degree C is 400 mm Hg while the vapor pressure of toluene at 55 degree C is 130 mm Hg. What is the vapor pressure of a solution consisting of 0.5 mole fraction of benzene and 0.5 mole fraction of toluene at 55 degree C? (A) lower than 1.30 mm Hg (B) between 130 and 400 mm Hg (C) exactly 400 mm Hg (D) greater than 400 mm Hg An oxide of rhenium crystallizes with eight rhenium atoms at the corners of the unit and 12 oxygen atoms on the edges between then. What is the formula of this oxide? (A) ReO (B) Re_2 O_3 (C) ReO_2 (D) ReO_3 The combustion of 2-propanol (M = 60.0 g middot mol^-1) occurs according to the equation 2 CH_3 CHOHCH_3 (I) + 9 O_2 (g) rightarrow 6 CO_2 (g) + 8 H_2 O (I) What is q for the combustion of 15.0 g of 2-propanol? (A) -5.01 times 10^7 kJ (B) -1.00 times 10^-3 k J (C) -2.01 times 10^3 k J (D) -4.01 times 10^3 kJ At what temperature does the reaction below change from favoring products to favoring reactants? SO_2 (g) + 1/2 O_2 (g) SO_3 (g) (A)162 K (B) 509 K (C) 1060 K (D) 1540 K Which isomer of C_4 H_8 has the lowest absolute entropy at 25 degree C? (A) 1-butene (B) cis-2-butene (C) trans-2-butene (D) cyclobtuane A 10.0 g piece of gallium (m = 69.7) at 25.0 degree C is placed in 10.0 g of H_2 O at 55.0 degree C. What is the final temperature when this system comes to equilibrium? (Assume the specific heat capacity of liquid Ga is the same as that of solid Ga.) (a) 35.0 degree C (B) 38.1 degree C (C) 41.8 degree C (D) 52.6 degree C In the Born-Haber calculation of the lattice enthalpy of Lif from its elements, which process is exothermic? (A) dissociation energy of F_2 (g) (B) electron affinity of F(g) (C) ionization energy of Li(g) (D) sublimation energy of Li(s) How much work is done by the gas when 1.00 of g of sodium azide, NaN_3 (m = 65.01 g middot mol^-1), decomposes in a container of changeable volume (e.g. an airbag in a car) against a constant pressure of 1.00 atm at 298 K) 2 NaN_3 (s) rightarrow 2 Na(s) + 3 N_2 (g) (A) +114 J (B) +57.2 J (C)-114 J (D) -57.2 J

Explanation / Answer

13. The option C is the correct answer

Because by increases of intermolecular forces between the molecules, it resists the flow of substances for liquid, so viscosity increases . Also the boiling poing point and enthalpy of vapourization increases due to increases of intermolecular forces.

But only the vapour pressure decreases because by the strong molecular attraction molecules of substance means liquid are tightly bound with each other and very hard to get the vapour pressure.

Hence option C is the correct answer.

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