# stiochiometry

Hello! This is my take home final for my chemistry class and I can use any resources to help me solve the questions. Can someone help me get started on all of them? Thanks…
(note: he wants us to solve them using stoichiometry)

1. The resting calorie use of a human is about 1,000 calories per day. In other words, just to perform the functions necessary to live, you need 1,000 calories of energy. In large part that energy comes from glucose in a reaction that cant be simplified as the combustion of glucose. The function of the lungs is to provide oxygen for that reaction as well as remove the waste. The air that the lungs take in is .05% carbon dioxide and 21% oxygen, and the lungs can hold 6 liters of air. If carbon dioxide concentrations over 8% are lethal, how long can a person theoretically hold their breath? Human body temperature is 37 C, and the pressure in the lungs is 1 atm.
Hint: the written and balanced equation for this reaction is: (numbers after underscore are moles of the element)

(C_6 H_12 0_6) + 60_2 → 6CO_2 + (6H_2 O)

2. Nitrogen tri-Iodide is an extremely unstable compound that will decompose explosively with as little pressure as a fly walking on it. Assuming that the temperature of the revolting gases is at 25 C at 1 atm, and the density of NI_3 is 1.2 g/cm^3, what is the ratio of the volume of reactants to the volume of products?

3. A rough approximation of the relationship between altitude and pressure below 30,000 ft. can be given with the equation: -0.0024h + 101.33P, where “h” is the altitude in ft/. and P is pressure in kPa. Likewise, temperature is modeled as -.002h + 288= T, where “h” is altitude in ft. and T is temperature in Kelvins. Using this information, what is the equation for the volume (in Liters) of a weather balloon released at sea level and rising to 30,000 ft. if the initial volume of the balloon is 100,000L? If the balloon can only expand to twice its original volume, what is it maximum altitude before it pops? (conversion between celcius and kelvins is “273 + C= K” )

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1. If your teacher allows you to have others work the exam for you, report him to the dean. Somebody is getting cheated out of an education.

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2. actually he does have our administrators permission to do this, especially since we have an in-class final where we cannot use any resources or notes. i am not a cheater and i don't want the answers, i just want to know how to get started on these problems, as i have stated before

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posted by Roberta
3. chimeastry thing

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posted by optta

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