3 posts • Page 1 of 1
C(gr) represents carbon as graphite. Graphite is the most stable form of carbon at normal temperatures. The standard enthalpy of formation of an element in its most stable form is zero. For instance, the standard enthalpy of formation of C(gr) is zero because C(gr) --> C(gr) is a "null formation". However, the enthalpy of formation of an element in a form other than its most stable one is nonzero. For example, C(gr) --> C(diamond) is endothermic. The standard enthalpy of formation of diamond is +1.9 kj/mol.
Who is online
Users browsing this forum: No registered users and 2 guests