If 89.6 L of carbon dioxide at STP are produced, how many grams of oxygen must have been reacted for the reaction: CH«(g) + 2O2(g) –
CO2(g) + 2 H2O(1)

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.

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