Figure 1.01a: (a.)The surface of a single grain of table salt.

CRS Question, 6–20

QUESTION

The following reaction shows the conversion of ozone to oxygen and provides the standard enthalpy change for the process:

2 O3 ® 3 O2; DH = –427 kJ

What is the DH value for the conversion of one mole of O2 to O3?

1. +427 kJ

2. +641 kJ

3. +142 kJ

4. +285 kJ