In a polystyrene calorimeter, a student dissolved a 7.50 g sample of NH4NO3(s) in water to make 85.0 mL of solution that was initially at a temperature of 21.0°C. Once all of the ammonium nitrate had dissolved, the final temperature of the solution was 14.5°C. The molar enthalpy of solution for ammonium nitrate is calculated to be kJ/mol. Record your 3-digit answer. Include sign; do not include units.

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A:

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A:

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Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.