Which of the following statements is are/true? Liquid mercury forms a convex men

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Which of the following statements is are/true? Liquid mercury forms a convex meniscus in glass as its cohesive forces due to metallic bonding are greater than the adhesive forces between the mercury and the glass surface. The surface tension of a liquid is the energy required to increase the surface area by a certain amount and therefore the surface tension is lower for substances with weaker intermolecular forces. Viscosity is resistance to flow and the viscosity at 40 degree C will be lower than the viscosity at 20 degree C as increased thermal energy will partially overcome the substance's intermolecular forces. Octane, CH_3(CH_2)_6CH_3 has a higher viscosity at 20 c than would pentane, CH_3(CH_2)_2CH_3 All of the above are true. 6. Which of the following is true? The rate of vaporization increases with decreasing surface area and temperature. The stronger the intermolecular forces, the more likely it is that molecules will evaporate at a given temperature, making the liquid more volatile. If the enthalpy of vaporization of butane, C_4H_10 is 21.0 kJ/mol, then it would require 18.1 of energy to vaporize 50.0gof butane at its boiling point. D) The substance with the highest vapor pressure at the same temperature between BF_3 SiS_2, CH_3SCH_3, RbCl, and SbH_3 is SbH_3. SbH_3. The substance with the highest enthalpy of vaporization between H_2, CH_3CH_2OH, CH_3OCH_3 and CH_3CH_2CH_3 is CH_3OCH_3. The normal boiling point for benzene is 80.1 degree C. what would its boiling point be on the top of Mt. Everest where the atmospheric pressure is only 260 torr? The Delta H_vap = 30.7 kJ/mol for benzene. 78 degree C B 19 degree C 121 degree C 27 degree C 47 degree C Which of the following statements is NOT true? Heats of deposition and sublimation for a substance are opposite and equal. At the triple point solid, liquid, gas all exist together. If you apply enough heat to a supercritical fluid that is at a pressure greater than its critical pressure it will convert to a gas. Supercritical fluids have characteristics of both liquid and gases. Fusion typically takes less heat than vaporization.

Explanation / Answer

Q7.

Apply

P1 = 760 atm; T = 80.1°C = 80.1+273 = 353.1

P2 = 260 atm; T = ?

H = 30.7 kJ/mol = 30700 J/mol

so

apply Clasius Clapeyron equation

ln(P2/P1) = dHVap/R*(1/T1-1/T2)

substitute

ln(260/760) = 30700/8.314*(1/(80.1+273) - 1/T2))

-1.072 * (8.314/30700) = 0.00283- 1/T2

1/T2 = -(-1.072 * (8.314/30700)-0.00283)

T2 = 0.0031203^-1 = 320

T2 = 320-273 = 47°C

Q8

a) TRUE, since it is the reverse process of each other

b) True, as the name implies, three phases in the triple point

c) False,it remains

d) true, therefore, fluids, i.e. gas + liquid

e) true, since there is more energy between liqui-vapor bonds than solid-liquid

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