Which compound is most difficult to decompose?
co
ch4
no2
no

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.

Idon't mean to be a smart alec, length of atoms' bonds is the simplest way to define it.

Answerrestate the main idea,essay or thesis, summarize the three subpoints of your essay, leave the reader with an interesting final impression;

Answerlimiting reactant;