Purchase Solution

Working with enthalpy change for dissolution

Not what you're looking for?

Ask Custom Question

In a coffee-cup calorimeter, 1.10 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.93°C. Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.

Purchase this Solution

Solution Summary

The solution gives not only the answers but also the steps required to arrive at the answer. No mathematical step was avoided in the derivation.

Solution Preview

We have heat evolved in the reaction as,

q = m x c x dT

here, m = 1.10 + 76 = 77.1 g

c = 4.08 J/C g

dT = T final - Tinitial = 23.93 - 25 = - 1.07 C

Therefore, q = -77.1 * 4.08 * 1.07 = -336.59 J

That is after dissolution heat is ...

Purchase this Solution

Free BrainMass Quizzes
Functional groups in Organic Chemistry

You will be tested on the names of functional groups in Organic Chemistry. It is very important to know the functional groups to understand Organic reactions.

Organic Chemistry Naming: Alkanes

This is a quiz which is designed to assist students with learning the nomenclature used to identify organic compounds. This quiz focuses on the organic compounds called Alkanes.


The quiz helps in revising basic concepts about thermochemistry.

Match Elements with their Symbols

Elements are provided: choose the matching one- or two-letter symbol for each element.