For which one of the following is ΔHfo zero?

A. O (g)

B. Na (s)

C. CO2 (s)

D. N2 (l)

Question

Guest

Chemistry

19 November, 17:17

For which one of the following is ΔHfo zero?

A. O (g)

B. Na (s)

C. CO2 (s)

D. N2 (l)

+3

Answers (2)

Know the Answer?

Beau Garrison · Answer 1

The standard enthalpy of formation is zero for B and D since by definition, the standard enthalpy of formation for an element at its standard state is zero. The monatomic oxygen is not the standard state of oxygen while carbon dioxide is already a molecule.

Sergio Small · Answer 2

Sergio Small 19 November, 17:44

0

The answer is most likely C

For which one of the following is ΔHfo zero?A. O (g)B. Na (s)C. CO2 (s)D. N2 (l)

For which one of the following is ΔHfo zero?

A. O (g)

B. Na (s)

C. CO2 (s)

D. N2 (l)