science
posted by Samantha .
Calculate the number of molecules in a deep breath of air whose volume is 2.68 L at body temperature, 37°C, and a pressure of 743 torr
(b) The adult blue whale has a lung capacity of 5.0 103 L. Calculate the mass of air (assume an average molar mass 28.98 g/mol) contained in an adult blue whale's lungs at 0.0°C and 1.00 atm, assuming the air behaves ideally.
how do i do these?

science 
Elena
(a)
V=2.68 L = 0.00268 m³,
t=37°C => T=310 K,
p=743 torr =99058.246 Pa
R=8.31 J/mol
pV=nRT
n= pV/RT = 99058.246•0.00268/8.31•310 =0.1 mol
N= n•N₀=0.1•6.02•10²³=6.02•10²² molecules
(b)
V=5•10³ L=5 m³
μ=28.98 g/mol=28.98•10⁻³ kg/mol
t=0℃ =273 K
p =1 atm = 101325 Pa
pV=mRT/μ
m=pVμ/RT=101325•5• 28.98•10⁻³/8.31•273 =6.47 kg
Respond to this Question
Similar Questions

Chemistry
1. Calculate the number of molecules in a deep breath of air whose volume is 2.15 L at body temperature, 36 degrees Celsius, and a pressure of 740 torr. 2.A fixed quantity of gas at 24 degrees Celsius exhibits a pressure of 740 torr … 
Physics
A submarine has run into trouble and is stuck at the bottom of the ocean. Several people are on board and must make their way to the surface without any diving gear. The air pressure aboard the submarine is 3.29 atm. air temperature … 
PHYSICS
A submarine has run into trouble and is stuck at the bottom of the ocean. Several people are on board and must make their way to the surface without any diving gear. The air pressure aboard the submarine is 3.04 atm. The air temperature … 
Physics
A submarine has run into trouble and is stuck at the bottom of the ocean. Several people are on board and must make their way to the surface without any diving gear. The air pressure aboard the submarine is 3.100 atm. The air temperature … 
Chemistry
The adult blue whale has a lung capacity of 5.0*10^3L. Calculate the mass of air (assume an average molar mass 28.98 g/mol ) contained in an adult blue whale’s lungs at 0.3 degrees Celcius and 1.10 atm., assuming the air behaves … 
chem
At room temperature (25oC) and normal atmospheric pressure (760 torr), the average person’s lungs have a total capacity of about 5.5 liters. If a person takes a deep breath and then dives deep into a lake where the temperature is … 
AP Chemistry
If a breath of air has a volume of 1.02L at a pressure of 750 Torr and 37°C, calculate the number of molecules of air in the breath. 
Chemistry
The world record for a human holding their breath is 11 minutes, but most people can only hold it for a few minutes. If a women holds her breath at the maximum lung capacity (4.2 L), calculate the final pressure in her lungs, if her … 
Chemistry
Calculate the number of molecules in a deep breath of air whose volume is 2.25L at body temperature, 37 Celsius, and a pressure of 735 torr. Answer is 5.15 x 10^22 molecules. Help me! 
Chemistry
The adult blue whale has a lung capacity of 5.0 x 10^3L. Calculate the mass of air (assume an average molar mass of 28.98g/mol) contained in an adult blue whales lungs at 0.0 Celsius and 1.00atm, assuming the air behaves ideally. I …