Question

Of the following Delta H is not zero for _____.

A) Cl₂ (g)
B) N₂ (g)
C) F₂ (s)
D) O₂ (g)
E) C (graphite)

Answer 1

The standard enthalpy change (ΔH) is not zero for Cl₂ (g), N₂ (g), F₂ (s), and O₂ (g), but it is zero for C (graphite).

Step-by-step explanation:

Of the given options, the standard enthalpy change (ΔH) is not zero for:

• A) Cl₂ (g)
• B) N₂ (g)
• C) F₂ (s)
• D) O₂ (g)
• E) C (graphite)

Based on the information provided, the standard enthalpy of formation of any element in its standard state is defined as zero. Thus, ΔH is not zero for Cl₂ (g), N₂ (g), F₂ (s), and O₂ (g), but it is zero for C (graphite).