Question

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1. What is the strongest intermolecular force between the two compounds: a. HF and NH3 b. H2 and CCL C. NO3 and BF3 d. CzHg and HCI 2. What type of crystalline solid will be formed for the following compounds a. CH3OH b. S c. Ca d. Lici 3. The structure of ZnS is face-centered cubic structure, the length of one side is 236 pm. What is the density of the ZnS compound? I 4. X-rays of wavelength 0.127 nm strike an aluminum crystal; the rays are reflected at an angle of 16.5º. Assuming that n=1, calculate the spacing between the plane of aluminum atoms (in pm) that is responsible for this angle of reflection. 5. The vapor pressure of ethanol is 400.0 mmHg at-47.3°C. What is ethanol's molar heat of vaporization if the vapor pressure of ethanol at -71.2°C is 100.0 mmHg? 6. What is the percent by mass of 2.6 g of Na2SO4 dissolved in 65.2 g H20? 7. What is the molality of a solution that is 10.2 % by mass Fe(NO3)2? 8. The density of a 6.5 M NaCl solution is 0.924 g/mL. What is the molality of this solution?

Answer 1

Q.1)

a)HF because Hydrogen bonding.

b)CCl4

c)BF3

d) HCl

Q.2)

a) CH3OH= Molecular solid

b) S= atmoic solid

c) Ca = metallic solid

d)LiCl= Ionic solid

acedge length M=mol, mass 0.2 we know that deneity ()- zem Noxa Zano of atom No- Avogadro's numbe -> a = 4897-47 6.02371023462-3681610) 2d = 4.qx107 glm² We know from Broy's equation na = 20 emne nal, As Werelength 2 1.2741010m Q = 16.5°, da sparing 1.2140 10 - 20 dxsin 16.50 . d = 2.28 410" m = 2.28 Aº Qy -> 10