A.) Nickel crystallizes with the face-centered cubic unit cell. The radius of a

Question

A.) Nickel crystallizes with the face-centered cubic unit cell. The radius of a nickel atom is 124 pm .Calculate the edge length of the unit cell.

B.) Strontium has density of 2.64 g/cm3 and crystallizes with the face-centered cubic unit cell. Calculate the radius of a strontium atom.

C.) The alkanes are a homologous series of compounds containing only carbon and hydrogen that have the general formula CnH2n+2. Members of this series include butane (C4H10), 3,3-dimethylpentane (C7H16), hexane (C6H14), and heptane (C7H16). The boiling points for a set of compounds in a homologous series can be qualitatively predicted using intermolecular force strengths. Using their condensed structural formulas, rank the homologous series for a set of alkanes by their boiling point.

E.) The vapor pressure of a substance is measured over a range of temperatures. A plot of the natural log of the vapor pressure versus the inverse of the temperature (in Kelvin) produces a straight line with a slope of ?3.48×103 K .
Find the enthalpy of vaporization of the substance.

_____ kJ/mol

F.) How much heat (in kJ) is required to warm 12.0 g of ice, initially at -12.0 ?C, to steam at 112.0 ?C? The heat capacity of ice is 2.09 J/g??C and that of steam is 2.01 J/g??C.

_____kJ

Explanation / Answer

Nickel crystallizes in a face-centered cubic unit cell

For nickel atom face centered cubic structure edge length

(a)= 4*r/ 2

a = 4*124/2

a= 196/1.414 = 350.77 pm = 350.77 ×10-10 = 3.5077 ×10-8cm

Edge length of unit cell of nickel is 3.5077 ×10-8 cm

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