Mass and Energy Transfer - 1. A lagoon with volume 1200 m^3 has been receiving a steady flow of a conservative waste at a rate of 100m^3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10mg/L. Assuming completely mixed conditions, a) what would be the concentration of pollutant in the effluent leaving the lagoon? b) I...

ideal gas law - question is: what volume of oxygen gas is required to burn 0.5562 of propane gas C3H8 if both gases are emasured at the same temperature. Please explain how to set up problem, thank-you. When it states at the same temperature and pressure does this mean STP? Thank-you.

the amount of natural gas burned is proportional - please see attached

Growth rate/doubling time - 3.4) Suppose we express the amount of land under cultivation as the product of four factors: Land = (land/food) x (food/kcal) x (kcal/person) x (population) The annual growth rates for each factor are: 1) the land required to grow a unit of food, -1% (due to greater productivity per unit of land) 2) the amount of food grown per calorie of food eaten by a human, ...

Capacity yield - 3.17) A lake has a carrying capacity of 10,000 fish. At the current level of fishing, 2000 fish per year are taken and the fish population seems to hold fairly steady at about 4000. If you wanted to maximize the sustainable yield, what would you suggest in terms of population size and yield?