A man drove his car through the Nevada desert one day when the temperature was over 100°F. When he started the trip, the gas sta
tion attendant found the tire to be 32 lb/in2. When he filled up with gas after crossing the desert, an attendant found the tire pressure to be 38 lb/in2. What is the best explanation for the increase in tire pressure? The road wear on the tire caused a decrease in volume and, therefore, an increase in tire pressure.
The temperature in the tire increased, causing an increased tire pressure.
The hot temperature caused the springs to expand, which allowed more weight to ride on the tires, thus causing more pressure inside.
The measurements of the pressure were inaccurate. The added weight of the gas caused the extra pressure in the tires.
Now the change in the Gibbs free energy for this reaction is computed via (don't forget that oxygen's Gibbs free energy of formation is 0 since it is an element):
Δ4Δ5Δ-Δ
Δ
Δ
Now, since the calculation is done for 1 mol of butane, the change in the Gibbs free energy for this fuel is:
