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help please A 20.0g sample of ammonium chloride is added to 125mL of water at 20.0C in a calorimeter. The resulting solution has a final

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A 20.0g sample of ammonium chloride is added to 125mL of water at 20.0C in a calorimeter. The resulting solution has a final temperature of 9.4C. Calculate the molar enthalpy change for this change. Then, show the energy change with a potential energy diagram. (A1 and D2)

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