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At roughly what pressure and temperature will diamond, graphite, and liquid carbon all exist in equilbrium? Which solid form of carbon is more dense? The density of solid W is 19.3 g/cm3. How many atoms are present per cubic centimeter of W? As a solid, W adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of W? What is the volume of a unit cell of this metal? A crystal was analyzed using X-ray diffraction with radiation from a copper source. The observed angle was 11.99 degree. Determine the distance between layers of the crystal. The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic attraction holding that compound together. Based on ion charges and relative ion sizes, rank these ionic compounds by their expected melting points. Highest melting point. The properties of several unknown solids were measured. Classify these solids. Classify each of these solids. * also known as covalent-network solids or macromolecular solids. A certain liquid has a vapor pressure of 92.0 Torr at 23.0 degree C and 345.0 Torr at 45.0 degree C. Calculate the value of delta H degree vap for this liquid. Calculate the normal boiling point of this liquid. The vapor pressure, P of a certain liquid was measured at two temperatures, T. The data is shown in the table. If you were going to graphically determine the enthalpy of vaporization, delta Hvap, for this liquid, what points would you plot? Determine the rise, run, and slope of the line formed by these points. what is the enthalpy of vaporization of this liquid? A certain substance has a heat of vaporization of 32.36 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.00 times higher than it was at 285 K? Using the following data, calculate delta Sfus and delta Svap, for Cs. Two 20.0-g ice cubes at -19.0 degree C are placed into 295 g of water at 25.0 degree C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. At 1 atm, how much energy is required to heat 43.0 g of H2O(s) at -14.0 degree C to H2O(g) at 143.0 degree C? Calculate the heat energy released when 15.4 g of liquid mercury at 25.00 degree C is converted to solid mercury at its melting point. A hypothetical molecule, X-Y, has a dipole moment of 1.33 D and a bond length of 193 pm. Calculate the percent ionic character of this molecule. Classify these molecules as polar or nonpolar.

Explanation / Answer

1) Diamond is more dense

temp T= 4100 K

pressure P= 10^5 atm

2) 3.16 x 1022

volume = 3.1657 x 10-23

edge = 3.163 x 10-8

3) According to Braggs law

n x lamda = 2d Sin theta

d= n x lamda / 2 sin theta

d= 154 / 2 x sin 11.99

d= 370.65

distance is 370.65 pm

4) melting point of Ca0 > CaF2 > KF > RbBr

5) IOnic - B

molecular - A,D

metallic - C

covalent - c

6) Ionic - CaCl2

COvalent - Diamond

molecular - Scl2

mettalic - K

7) dH vap = 47.01 kJ /mol

Boiling point = 332.78 K = 59.78 C

8) ( x,y) are 3.07 x 10-3 , 1.105

( x,y ) are 1.73 x 10-3 , 1.611

Slope = -377.61

rise =0.506

run = -1.34 x 10-3

dH vap = 3139 .76 J /mol

9) 317.20 K

10)

dSfu = 6.95 J/K/mol

dS vap = 70.06 J/K /mol

11) 17.76 C

12) 134.46 kJ

13) 0.3128 kJ

14) 14.36 %

15) Polar - S02 , Brf5

non polar - C02 ,

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