Instead of collecting gas with a syringe, another method involves: • Submerging the evidence in a special agent • Placing a strip of charcoal in the airtight container • Using a tiny vacuum • All of the above​

Using a tiny vacuum

If it isn’t a then it has to be d idk tho cause there’s no picture

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.