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A 1-m square thin plate of solid naphthalene is oriented parallel to a stream of air flowing at 20 ds. The air is at 330 K and 101.3 kPa.
Molecular diffusion of gaseous reactant and products takes place through a gas film adjacent to the carbon surface.
A solution of carbon tetrachloride and carbon disulfide containing 50%by weight of each is to be continuously distilled at a rate of 5000 kg/h.
The LNG is heated to 320 K and 140 kPa, and vaporizes completely. Estimate the density of the gas mixture under these conditions.
The molar fractions of CO2, and 0, in a sample of the gas are 12% and 6%, respectively. The weight fraction of H2O in the gas is 6.17%.
A gas stream flows at the rate of 10.0 m3/s at 300 K and 102 kPa. It consists of an equimolar mixture of ammonia and air.
Air, stored in a 30-m3 container at 340 K and 150 kPa, is saturated with water vapor. Determine the following properties of the gas mixture.
To account for water losses in the cooling tower, part of the effluent from a nearby municipal wastewater treatment plant will be used as makeup water.
It is desired to dry 10 kg/min of soap continuously from 20% moisture by weight to 4% moisture in a countercurrent stream of hot air.
Estimate how much activated carbon should be used if the system is allowed to reach equilibrium at constant temperature and pressure.
Estimate the diffusion coefficient by the Wilke-Lee equation and compare it with the experimental value.
Oxygen diffusion in water: Hayduk and Minhas correlation Estimate the diffusion coefficient of oxygen in liquid water at 298 K.
Based on this result and the Hayduk and Minhas correlation for aqueous solutions, estimate the molar volume of allyl alcohol at its normal boiling point.
The concept of carrying capacity is a useful one for the ecological analysis of animal and plant populations.
What evidence would you use to evaluate the proposition that the world is reaching the maximum carrying capacity in terms of food supply?
What kinds of incentives are required to induce greater erosion control? How much can be done through private initiative.
How can we define the concept of sustainable agriculture? Can high-input agriculture be sustainable? Is organic agriculture sustainable?
Do you expect mineral prices to continue to increase, as shown in Figure? Which factors do you think will determine future mineral prices?
Some critics of municipal recycling programs have argued that they are uneconomic because they cost more than ordinary waste disposal.
Since energy production represents only about 5 percent of economic output, why should any special importance be placed on this sector?
In the 1970s, energy shortages had a significant impact on economies throughout the world. Was this a one-time phenomenon or could it recur?
Many people argue that a transition to renewable energy sources would be good policy from both an economic and an environmental point of view.
Unlike ocean fisheries, forests can be privately owned, and in fact many millions of acres of forests are owned and managed by private corporations.
What changes in property regimes and forest management policies could be used to help achieve the dual goals of economic profitability.
Suppose you were managing a public water utility facing a shortage due to drought conditions. What steps would you take in response to the drought?