The Houston Police Department was called to a crime scene where a dead body was found. Unfortunately, the CSI: Houston team is on vacation and the police officers are seeking your help to estimate the time of death (TOD). The temperature at the crime scene is To = 20.0 °C. The temperature of the body was T1 = 35.5 °C when the police found the body and it is T2 = 34.0 °C when you arrived an hour later. Assuming that Newton's law of cooling applies, how many hours ago did the person die? The normal body temperature is T = 37.0 °C. %3D Hint: Newton's law of cooling: = -k(T – T.) dt

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Basic Chemical Calculations (Process and Variables)

A basic chemical calculation involves the application of the law of chemical proportions to various reactions and material and energy balance calculations on various chemical processes. Basic chemical calculation helps students analyze various chemical processes and develop problem-solving skills. The chemical manufacturing processes are divided into unit operations involving physical changes of material and unit processes involving the chemical transformation of materials. For instance, fluid flow, heat transfer, and mass transfer are unit operations, and oxidation, reduction, and pyrolysis are unit processes.