ᴵ ʷᵃˢ ᵃ ʳᵉᵃˡˡʸ ᵇᵃᵈ ᵍⁱʳˡ ᴾᵘⁿⁱˢʰ ᵐᵉ ʷⁱᵗʰ ʸᵒᵘʳ ᵈⁱᶜᵏ ⁱⁿ ᵐʸ ᵐᵒᵘᵗʰ
ᴄｏᴍᴇ２ᴍᴇ
ᵇʳᵃⁱⁿˡʸ.ᵗᵒᵈᵃʸ

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.

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2