Define stoichiometry and explain why it is such a useful tool for chemists

Define stoichiometry and explain why it is such a useful tool for chemists. ...Explain what a limiting reactant is and why it is important in stoichiometry. A limiting reactant is the reactant in a chemical equation that runs out first. It is important because its quantity determines the amount of products produce

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.