the high temperature contribution of vibrational modes to the molar heat capacit

Question

the high temperature contribution of vibrational modes to the molar heat capacity of a solid at constant volume is R for each mode of vibrational motion. Hence, for a monatomic solid, the molar heat capacity at constant volume is approximately 3R. (a) The specific heat capacity of a certain monatomic solid is 0.392J*k^-1*g^-1. The chloride of this element (XCl2) is 52% chlorine by mass. Identify the element. (b) This element crystallizes in a face-centered cubic unit cell and its atomic radius is 128pm. What is the density of this solid?

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