You are an engineer working on the design of a toilet that converts human waste into methane gas. Only solid human waste enters the toilet and is decomposed (by microorganisms) to produce methane gas and fertilizer. An undesirable by-product of the process is H2S gas, which is removed by a scrubber (it does not exit the toilet). Write an unsteady state mass balance on the H2S gas, human solid waste, and methane.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat