Achemical reaction is most likely to occur spontaneously if the

- For a spontaneously reaction to takes place, the system must has a negative free-energy change ΔG.
- Because changes in all (free energy - entropy and enthalpy) are related to each other by the following equation :
ΔG = ΔH-TΔS,
So ΔG becomes more negative when entropy (randomness) increases, i.e.  when the products of a reaction are more disordered and less complex than the reactants.

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons

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