What is the mole ratio of butane to carbon dioxide

Mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced equation.
Butane is an organic compound with the formula C4H10 and carbon dioxide is compound (gas) with the formula CO2.
The chemical reaction between butane and carbon dioxide is:
C4H10 + O2 -> CO2 + H2O 

It should be balanced: 
2C4H10 + 13O2 -> 8CO2 + 10H2O 

So, the balanced coefficient of butane is 2, and that of carbon dioxide is 8. According to thid, the mole ratio of butane to carbon dioxide is 2:8 or 1:4.

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.