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What is the thermal energy 100cm3 of aluminum at 1000c ?

Short Answer

Expert verified

The thermal energy of aluminum at 1000CisEth=93.1kJ

Step by step solution

01

Step :1 Introduction 

In the microsystem, the potential energy between the bonds is zero, and the kinetic energy of the system is translational kinetic energy. As a result, a solid's thermal energy is nmoles is given by equation (20.39)in the form

Eth=3nRT

The state variables that describe the state of the system are used to describe a macroscopic system. One of the state variables is density, which is determined by the ratio of the other two state variables (mass and volume) and may be calculated using equation (18.1) in the form

ρ=MV

02

Step  :2 Explanation 

Knowing the massMand the molar mass m, we can get the number of moles by

M=nm

We substitute the number of moles ninto equation (1) to get the thermal energy by

Eth=3ρVmRT

03

Step :3  Substitution 

The density of aluminum is ρ=2.7g/cm3, the molar mass is m=27g/mol. Now, we plug the values for and Tinto equation (3) to get Eth

Eth=3ρVRTm

=32.7g/cm3100cm3(8.314J/Kmol)373K27g/mol

=93.1×103J

=93.1KJ

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