grace2245 grace2245

15-05-2017
Chemistry

contestada

For which one of the following is ΔHfo zero?

A. O (g)
B. Na (s)
C. CO2(s)
D. N2(l)

Respuesta :

danielankin danielankin

24-05-2017

The answer is most likely C

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MissPhiladelphia MissPhiladelphia

27-05-2017

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.

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