A compound dissolves in water at a rate proportional to the product of the amount undissolved and the difference between the concentration in a saturated solution and the concentration in the actual solution at any time. A saturated solution of compound contains 40 g/100 g H2O. In a test run starting with 20 kg of undissolved compound in 100 kg of pure compound is found that 5 kg is dissolved in 3 hr. If the test continues, how many kilograms of compound will remain undissolved after 7 hr? Assume that the system is isothermal. Solution containing undissolved compound Figure 4

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Hazard Analysis and Design in Chemical Engineering

Hazard is the intrinsic property of a material or process which harms the people, buildings, or environment. Health, safety, hazard, risk assessment, loss prevention, and environmental consideration play an important role while designing a chemical processing plant. Hazard is often confused with risk. Risk measures the magnitude of loss and injury of likelihood incidents or the consequence and frequency of incidents.