The best replacement for delta g is delta h.

The best alternatives to delta g are rated as following:
★★★★★  delta h
★★★★  delta g prime
★★★  delta g0
★★★  delta g standard
★★★  delta g not
  delta g zero

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Speaking about delta g, one probably shouldn't forget about kp.

Other search terms related to delta g and their ratings are:
★★★★★ kp
★★★★★ keq
★★★ equilibrium constant
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delta g
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delta g prime