A reaction<span> is "</span>spontaneous<span>" when the total products have lower Gibbs free energy than the total reactants. Note that </span>spontaneous reactions<span> in this sense do not always occur quickly, however. A </span>reaction<span> is "</span>spontaneous<span>" when the total products have lower Gibbs free energy than the total reactants. hope that helped</span>
0.0005411
0.00054 is the real answer
you use the one with the least significant figures as the reference of how many to use.
101 three sig figs
001 one sig figs as well as 0.001
9.000 four sig figs
On Earth it is relatively rare—5.2 ppm by volume in the atmosphere. Most terrestrial helium<span> present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of </span>helium<span>-4 nuclei.</span>
