1. Predict which of the following liquids has greater surface tension: ethanol (
ID: 818355 • Letter: 1
Question
1. Predict which of the following liquids has greater surface tension: ethanol (C2H5OH) or dimethyl ether (Ch3OCH3).
2. Metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287 pm. The density of iron is 7.87 g/cm^3. How many iron atoms are within a unit cell?
3. A face-centered cubic cell contains 8 X atoms at the corners of the cell and 6 Y atoms at the faces. What is the empirical formula of the solid?
4. The distance between layers in a NaCl crystal is 282 pm. X rays are diffracted from these layers at an angle of 23.0(degree). Assuming that n = 1, calculate the wavelength of the X rays in nm.
5. How much heat in (kJ) is needed to convert 866 g of ice at - 10 (degree)C to steam at 126(degree)C? (The specific heats of ice and steam are 2.03 J/g *(degree)C and 1.99 J/g* (degree)C, respectively.)
6. The molar heats of fusion and sublimation of molecular iodine are 15.27 kJ/mol and 62.30 kJ/mol, respectively. Estimate the molar heat of vaporization of liquid iodine.
7. The following compounds, listed with their boiling points, are liquid at -10(degree)C: butane,-0.5(degree)C; ethanol, 78.3( degree)C; toluene, 110.6(degree)C. At -10(degree)C, which of these liquids would you expect to have the highest vapor pressure? Which the lowest? Eplain.
8. Vapor pressure measurements at several different temperatures are shown below for mercury. Determine graphically the molar heat of vaporization for mercury.
t (degreeC) 200 250 300 320 340
P(mmHg) 17.3 74.4 246.8 376.3 557.9
9. The vapor pressure of benzene, C6H6, is40.1 mmHg at 7.6(degree)C. What is its vapor pressure at 60.6 (degree)C? The molar heat of vaporization of benzene is 31.0 kJ/mol.
10. At -35(degree)C, liquid HI has a higher vapor pressure than liquid HF. Explain.
11. Melamine forms a precipitate by hydrogen bonding with cyanuric acid (C3H3N3O3), another contaminant present. The resulting stomelike particles caused severe kidney damage in many babies. Draw the hydrogen-bonded complex formed from these two molecules. Melamine and Cyanuric acid.
12. A sample of limestone (CaCO3) is heated in a closed vessel until it is partially decomposed. Write an equation for the reaction and state how many phases are present.
Explanation / Answer
1.
C2H5OH because it can hydrogen bond and therefore has stronger intermolecular forces
2.
Volume of the unit cell = (287 pm)
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