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18.2 The First Law of Thermodynamics

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  • at 1.0 atm at 20°C. What is the change in internal energy for the reaction?

    1. When iron dissolves in 1.00 M aqueous HCl, the products are FeCl2(aq) and hydrogen gas. Calculate the work done if 30 g of Fe react with excess hydrochloric acid in a closed vessel at 20°C. How much work is done if the reaction takes place in an open vessel with an external pressure of 1.0 atm?


    1. −350 J; 8.2 kJ
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