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1550554742427-1733967237.jpg Determine which of the following reactions taking place at constant pressure represents system that do work on the surrounding environment-

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8th 

Looking at  the molar coefficients of products and reactants. Work on the surroundings will be done when the number of moles of gases in the products is greater than the number of moles of gas reactants. Both II and III meet these criteria. And in 1st reaction, no gas molecules formed 

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