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A container of fixed volume contains 8.72 * 10 ^ 23 helium atoms, each of mass 6.646 * 10 ^ - 27 * kg . You put the container in a freezer and decrease its temperature from 25.0 °C to -135 °C. What are

(a) the change in the thermal energy of the gas and

(b) the change in its entropy?

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