Compressing a sample of ideal gas irreversibly requires 1.8 kJ of work to be done on the sample of gas by the surroundings.  a) Explain the sign of work. Provide an explanation to support your answer that includes what is occurring in the gas sample on the molecular level. b) Would the work when compressing the gas reversibly be less than or greater than the irreversible work given above? Explain your choice

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