Greater Vapor Pressure - General Chemistry - Solved Quiz, Exercises of Chemistry

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1. Which substance in each pair likely has the greater vapor pressure at room temperature?

a. CH 3 OH or CH 3 CH 2 CH 2 OH b. H 2 S or H 2 O c. C 6 H 6 or C 6 H 12 d. CH 3 OCH 3 or CH 3 OH e. NH 3 or PH 3

2. Which substances in the group below can exhibit hydrogen bonding?

CCl 4 3 OCH 3 CH 4 CH CH 3 NH 2

NH 3 4 SnH CH 3 OH HI

3. Identify the type of unit cell described by the information in each case.

a. Niobium packs into a unit cell that contains 2 atoms b. The coordination number of gold in its unit cell is 12 c. Two atoms touch each other along the edge of the unit cell of polonium d. When radon solidifies, its unit cell contains 4 radon atoms

4. Platinum metal is known to pack in a face-centered cubic unit cell with a lattice constant of 3.92×10-10^ m. Determine the atomic radius of a platinum atom.

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5. A certain substance adopts a body-centered cubic unit cell. If the atomic radius of the atoms of the substance is 2.13×10 -10^ m, and its molar mass is 115.6 g/mol, what is the resulting density of the substance?
6. Which species in each pair is likely to have the higher vapor pressure?

diethyl ether or water ethyl alcohol or hexane

ethylene gycol or water

ammonia, NH 3 or water

7. How much heat is released when 1.00 mol of steam, initially at 145.0 °C, is cooled and converted to ice at -5.00 °C. The heat capacity of steam is 2.01 J/g·°C and of ice is 2.09 J/g·°C.

Answers: 1) CH3OH, H2S, C6H6, CH3OCH3, PH 3 2) CH3NH2, NH3, CH3OH 3a) BCC 3b) FCC 3c) SC 3d) FCC 4) 1.39×10-10^ m 5) 3.23 g/cm^3

6. diethyl ether, hexane, water, ammonia 7) 57.8 kJ

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