How many total atoms are in 12 NaBr?​

The total atoms are equal to 1 atom.

Yeah I was a little late to answer this but
1 I think

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.

Abbreviated as mg-25.