2- El azufre (s) es un elemento no metalico. Su presencia en el carbon produce el fenomeno de
la lluvia acida ¿Cuantos átomos hay en 16.3 g
de s?

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.

13) a 14) a15) b16) i don't know sorry17) a (maybe)

Are you going to give an example of the plant or?

Ithink the answer is b.