1. Gibbs phase rule degrees of freedom: write out the Gibbs phase rule equation for each of these circumstances, and calculate the degrees of freedom you would have to define or fix the system---

a. Gaseous oxygen and hydrogen, which can react together to form water in liquid form

b. The alkane hydrocarbons ethane, propane, butane, and pentane, which may be present in either gas phase and/or liquid phase, with no reaction occurring between any of these components

c. Benzene and ethylene, which can react to form ethylbenzene, which can further react with ethylene to form diethylbenzene, all present in either gas or liquid phase.