Part A Weigh the mass of the dried metal strips from test tubes 1 and 5 using the electronic balance. Record their masses in the
table.

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.

The answer is b because a,c,and d are opinons