Write an equation for the major chemical reaction which took place in the crucible when magnesium ribbon was heated

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.

It was ernest rutherford

Compound with sulfer  is bright red