3CaCl2 + 2AlF3 --> 3CaF2 + 2AlCl3 How many moles of CaF2 will form from 36 moles of AlF3?

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Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.