Which of the following will exhibit London dispersion force CH_3OH BF_3 CHCl_3 H

Question

Which of the following will exhibit London dispersion force CH_3OH BF_3 CHCl_3 HBr SO_2 Which of the following has the highest viscosity? CH_3CH_3 CH_2OHCH_2OH CH_3CH_2CH_2 CH_2 CH_2 CH_3 CH_2OHCHOHCHOHCH_3 CH_3 CH_2OH The edge length in a face centered cubic unit cell for a metallic solid is 320 pm What is the radius of the metal atom? 138 pm 160 pm 180 pm 113 pm 108 pm_______ A metal forms body center cubic unit cell with edge length of 360 pm. What is the atomic weight of the metal if the density of the metal is 14.4 g/cm^3? 101.1 g/mol 303.3 g/mol 202.2 g/mol 40.4 g mol 50.5 g/mol_______The vapor pressure of a 17.6 percent by mass aqueous solution of ascorbic acid C_6H_8O_6 is 23.2 torr at 25 degree C. What is the vapor pressure of water at the same temperature? 23.7 torr 22.7 torr 23.2 torr 24.7 torr 25.7 torr________What is the molality of 20.0 percent methanol CH_3OH in ethanol C_2H_5OH solution? 5.43 6.25 4.35 6.80 7.81 Which of the following is not a colligative property? Surface tension Osmotic pressure Boiling point Freezing point Vapor pressure Which of the following substance can be liquefied at -3 degree C? Substance, critical point (-5 degree C. 2 atm) Substance, critical point - 10 degree C. 5 atm) Substance, critical point (0 degree C, 5 atm) Substance, critical point (-7 degree C, 10 atm) Substance, critical point (-12 degree C, 3 atm) What is the normal boiling point of 3.45 m KNO_3 aqueous solution? The boiling point evation constant of water is 0.51degreeC/m. 100.51 degree C 108.80 degree C 101.76 degree C 102.80 degree C 103.52 degree C Which of the following has the highest boiling point. SO_2 NH_3 CO_2 CH_4 He_______

Explanation / Answer

1. Which of the following will exhibit London dispersion force?

_A. CH30H

B. BF3

C. CHCI3

D. Hbr -------------answer

E. SOz

London dispersion force ; they

are shown by nonpolar atoms in view of the associated developments of the electrons in connecting particles. Since the electrons in nearby atoms "escape" as they repulse each other, electron thickness in a particle

3. 3-2-1-4

2. Which of the following has the highest viscosity?

A. CH3CH3 )

B( CH2OHCH2OH

C. CH3CH2CH2CH2CH2CH3

D. CH2OHCHOHCHOHCH3

E CH3CH20H

Longer molecules ARR------------ BONDED up with each other,

hence There is highest viscosity

3. The edge length in a face cantered cubic unit cell for a metallic solid is 320 pm.

What is the radius of the metal atom?

  A. 138 pm

B. 160 pm-answer

C. 180 pm

D. 113 pm

E. 108 pm

R=d/2

4 . A metal forms body_ center cubic unit cell with edge length of 360 pm.

What is the atomic weight of the metal if the density of the metal is 14.4 g/cm)?

A. 101.1 g/mol

B. 303.3 g/mol

C. 202.2 g/mol-------------answer

l D.40.4 g/mol

E. 50.5 g/mol

360 pm x 1 cm/1010 pm = 360 x 10¯10 cm = 3.60 x 10¯8 cm

volume of the unit cell

=(3.60 x 10¯8 cm)= 4.6656e-23 =4.66 x 10¯23 cm3

mass of the two atoms in the body-centered cubic unit cell:

14.4 g/cm x 4.66 x 10¯23 cm3=6.7104e-22

mass of the one atom=6.7104e-22 /2=3.3552e-22

atomic weight = 3.3552e-22 x 6.022 x 1023 mol¯1 =202.050144

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