5.7 m + 2.11 m = 7.81_ ~ 7.81m___

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.

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

If this is a true or galse then its true but if not then what is the question?

2licl + 3o2 i yook the test and it was correct.