Question

using the following graph, identify the value of ( h_{\text{waling}} ) at point b. assume the substance is water.

a 2260 j/g
b -2260 j/g
c -334 j/g
d 334 j/g

Explanation:

Step1: Recall the concept of latent heat of vaporization

Latent heat of vaporization (\(H_{vap}\)) is the heat energy per unit mass required for a liquid - gas phase change. When heat is removed (as in this case), the latent heat of vaporization will be negative.

Step2: Know the value of latent heat of vaporization for water

The latent heat of vaporization of water is \(2260\ J/g\). Since heat is removed (exothermic process for the system of water), the value of \(H_{vap}\) will be \(- 2260\ J/g\)

Answer:

B. -2260 J/g