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GenaCL600 [577]
3 years ago
5

A woman is found dead on a boat floating in the middle of a lake at 4:30am. There is blunt force trauma to her head but no other

discernable damage. She is approximately 30 pounds overweight. She is wearing thermal clothing and a winter jacket, gloves, and hat. Climatological data indicate it was a clear, cold, and windy night with no precipitation. Calculate the time of death based only on a body temperature of 15.6°C (60.8°F)? Now consider the other factors presented. How would each affect this estimation?
Chemistry
1 answer:
Olenka [21]3 years ago
5 0

Answer:

Dead bodies lose one degree Celsius per hour, which we could deduce that the person died 12 hours ago.

Explanation:

On the other hand, it is very important to take into account that this number of hours is very approximate, since not only does it vary greatly with the environment and the acclimatization of the environment in which the person dies, but also in this specific case, insulating clothing was presented , which made the loss of body heat much more difficult and could easily be more than 12 hours.

The minimum for this particular situation is 12 hours to 24 hours possible postmortem.

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Answer:

The heat of combustion per moles of caffeine is 4220 kJ/mol

Explanation:

Step 1: Data given

⇒ When  benzoic acid sample of 0.245 grams is burned the temperature rise is 1.643 °C

⇒ When 0.260 gram of caffeine is burned, the temperature rise is 1.436 °C

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<u>Step 2:</u> Calculate the heat released: for combustion of benzoic acid

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<u>Step 3</u>: Calculate the heat capacity of the calorimeter:

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<u>Step 4:</u> Calculate moles of a 0.260 g sample of caffeine:

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Step 5: Calculate heat released: for combustion of caffeine

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Step 6: Calculate the heat of combustion per mole of caffeine  

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The heat of combustion per moles of caffeine is 4220 kJ/mol

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