When a 200 G Sample of Ammonium Nitrate (NH₄NO₃) Dissolves in 48

question 17

Multiple Choice

When a 2.00 g sample of ammonium nitrate (NH₄NO₃) dissolves in 48.0 g of water the temperature changes from 26.57 ° C to 23.50 ° C. Assuming the specific heat of the solution is 4.184 J/g × K, what is the enthalpy change for dissolving 2.00 g of ammonium nitrate in water?

• A) +616 J
• B) +642 J
• C) - 642 J
• D) - 616 J
• E) none of these

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Definitions:

Compression

The process of reducing the volume of a material by applying pressure, or in geology, the stress state in which rock is pressed together, increasing its density.

Tension

A force that stretches material or causes it to be pulled apart.

Columnar Joints

Vertically oriented, hexagonal columns of rock that form as a result of the cooling and contraction of volcanic or igneous rocks.

Internal Strain

The deformation within a material or body due to applied stress or pressure.