[trackgeek09]

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” )

[Borek]

Please read forum rules.

[trackgeek09]

yes i did read the forum rules thank you very much...it would be great if i knew what i was doing TO get started on the problems but unfortunately I don't so I need someone to help me get started on them (as i said earlier) and I will probably be able to figure them out from there. In fact, I could probably figure out these problems by myself eventually, but again unfortunately stoichiometry has not been easy for me to get the hang of, and that is what i need to solve these problems (t-table style) so again if anyone is out there with experience in these sorta of problems i would appreciate the help

[Borek]

2^nd looks easiest. Write balanced reaction equation. Assume you start with 1mL of NI₃. What's its mass? How many moles it is? How much nitrogen will be produced? Using pV=nRT - what will be this gas volume?