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OpenStudy (anonymous):

i need your help ! Adding 5.44 g of NH4 (s) to 150 of water in a coffe cup calorimeter ( with stirring to disslove the salt) resluted in a decrease in the temp from 18.6 C to 16.2C. caculate the enthalpy change for dissloving NH4 NO3 in water in KJ/ mol assume that the solution whose mass is 15.5 g has a specific heat capacity of 4.2 j/gK

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