Chemistry Practice Problems Phase Diagram Practice Problems Solution: Synthetic diamonds are made under conditions of hi...

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Solution: Synthetic diamonds are made under conditions of high temperature (2000 K) and high pressure (1010 Pa; 105 atm) in the presence of catalysts. Carbon’s phase diagram is useful for finding the condition for formation of natural and synthetic diamonds. Along the diamond-graphite line, the two allotropes are in equilibrium.(a) At point A, what is the sign of ΔH for the formation of diamond from graphite? Explain.

Problem

Synthetic diamonds are made under conditions of high temperature (2000 K) and high pressure (1010 Pa; 105 atm) in the presence of catalysts. Carbon’s phase diagram is useful for finding the condition for formation of natural and synthetic diamonds. Along the diamond-graphite line, the two allotropes are in equilibrium.

(a) At point A, what is the sign of ΔH for the formation of diamond from graphite? Explain.