(a) The molar heat capacity of a crystal is given by C v = 3 R for an ideal mona

Question

(a) The molar heat capacity of a crystal is given by

Cv = 3R

for an ideal monatomic solid. Use this equation to calculate the heat capacity at constant volume of beryllium in units of J/kg · K. Consult the periodic table.
J/kg · K

(b) Compare the answer in part (a) with the value given in the table below.
percentage difference =  %

Try to explain any disagreement between these two values.

This answer has not been graded yet.

Approximate Specific Heats and Molar Heat Capacities (Constant Pressure) Molar Mass, M Specific Heat, c (J/kg K) (kg/mol) Substance Aluminum 910 0.0270 Beryllium 1970 0.00901 Copper 390 0.0635 Ethanol 2428 0.0461 Ethylene glycol 2386 0.0620 2100 Ice (near 00C) 0.0180 470 Iron 0.0559 0.207 Lead 130 Marble (CaCO,) 879 0.100 0.201 Mercury 138 Salt (NaCl) 0.0585 Silver 0.108 4190 Water (iquid) 0.0180 Molar Heat Capacity, C 24.6 17.7 24.8 148.0 37.8 26.3 26.9 87.9 27.7 51.4 25.3 75.4.

Explanation / Answer

The disagreement is due to one value is taken at contant volume and other is taken at constant ptessure

due to different referance point comes the difference

1. the molar heat capacity of beriyilium = 1820 j/kg/k

from the table it comes out to be = 1970 j/kg/k

difference in percentage = (1970-1820/1820 )x 100 = 8.241%

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