A steel container of mass 125 g contains 19.0 g of ammonia, NH3, which has a molar mass of 17.0 g/mol. The container and gas are in equilibrium at 18.0°C. How much heat (in J) has to be removed to reach a temperature of −20.0°C? Ignore the change in volume of the steel. (The specific heat of steel is 452 J/(kg · °C). Enter the magnitude.)

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