What is its molecular compound name for ci4

IUPAC names; Tetraiodomethane or Carbon tetraiodide.

Common name; Carbon tetraiodide.

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.