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when would you have to atomize or sublimize carbon. lets say you had 3c(gr)+4H2(g)->C3H8(g) and I was trying to calculate enthalpy of formation- do I have to sublimize carbon? I'm confused as to when all the elements need to be in gas form vs their most stable state.
You must take deltaH sublimation into account of Carbon when finding delta H when using bond enthalpies. This is because the bond enthalpies in the table are given for bonds in gas phase, but the reaction has carbon in solid form.
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