HW 8.67

[Cindy Ngo 1E]

For parts b, c, and d, what does it mean to atomize and how do you know when to do it?

[AshleyAguilar_1F]

Graphite is solid, but we need it to be in the form of a gas. Sublimation is Hvapor - Hsolid, and the problem said the sublimation of carbon is +717 kJ*mol, so 717- 0 (enthalpy of carbon in it's most stable form graphite is 0) = +717kJ*mol^-1.

[stephanieyang_3F]

Why does carbon need to be in its gas phase? How do you know when you need to "atomize" a compound?

[stephanieyang_3F]

Also when you're writing out the reaction, and in this question they're asking for the standard enthalpy of formation of these compounds, do you assume that the compound is in the gaseous state? If so, why do we do that?