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(a) Calculate the number of molecules in a deep breath of air whose volume is 2.25 L at body temperature, 37 °C, and a pressure of 735 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 of 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.

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Casey Durgan
Casey DurganLv2
23 May 2020

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Related questions

a.Calculate the number of molecules in a deep breath of air whose volume is 2.25 L at body temperature, 37 ?C, and a pressure of 740 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 0.4 ?C and 1.07 atm, assuming the air behaves ideally.

.44 The compressed air tank of a scuba diver reads 3,200 psi at the beginning of a dive and 825 psi at the end of a dive. Convert each of these values to atm and mmHg. 6.48 If someone takes a breath and the lungs expand from 4.5 L to 5.6 L in volume, and the initial pressure was 756 mmHg, what is the pressure inside the lungs (in mmHg) before any additional air is pulled in? 6.52 How hot must the air in a balloon be heated if initially it has a volume of 750. L at 20.oC and the final volume must be 1,000. L? 6.56 If a plastic container at 1.0oC and 750. mmHg is heated in a microwave oven to 80.oC, what is the pressure inside the container (in mmHg)? 6.58 Assuming a fixed amount of gas, complete the following table:   P1 V1 T1 P2 V2 T2  a. 0.55 atm 1.1 L 340 K ? 3.0 L 298 K  0.0oC b. 735 mmHg 1.2 L 298 K 1.1 atm ?  ̶ 120oC c. 7.5 atm 230 mL 15 atm 0.45 L ? 6.62 Calculate the volume of each substance at STP. a. 4.2 mol N2 b. 6.5 g He c. 22.0 g CH4 6.64 What volume does 1.50  1024 molecules of CO2 occupy at STP? 6.66 How many moles of gas are contained in a compressed air tank for scuba diving that has a volume of 7.0 L and a pressure of 210 atm at 25oC? 6.68 If a cylinder contains 10.0 g of CO2 in 10.0 L at 325 K, what is the pressure? 6.74 If the pressure due to the striped spheres in the molecular art is 480 mmHg, what is the pressure due to the spotted spheres? What is the total pressure of the system? 

Boyles Law

a) A10.0 L sample of a gas at 25oC and 1.5 atm iscompressed at constant temperature to a volume of 1.0 L. What isthe new pressure?

b) A3.5 L sample of a gas at 1.0 atm is expanded at constanttemperature until the pressure is 0.10atm. What is the volume of the gas?

Charless Law

a) A2.5 L sample of gas at 25oC is heated to50oC at constant pressure. What is the finalvolume?

b) Whattemperature would be required to increase the volume from 2.5 L to6.0 L?

Avogadros Law

a) Assumingno change in temperature and pressure, how many moles of methane(CH4) need to be added to 0.50 moles of methane todouble the volume?

b) 50g of solid carbon dioxide evaporates to carbon dioxide gas atstandard temperature and pressure. What isthe volume of carbon dioxide gas?

Combined Gas Laws

Calculate the temperature when a 0.50 L sample of gas at 1.0 atmand 25oC is compressed to 0.05 L of gas at 5.0atm.

Ideal Gas Law

a) Whatis the volume of gas occupied by 10.0 g CH4 at37oC and 4 atm?

b) Whatis the mass of N2 required to occupy 5.0 L at80oC and 560 mmHg?

Molar Density of Gases

a) Whatis the density of He at STP?

b) Whatis the density of carbon dioxide at 120oC and 1.5atm?

Application of Gas Laws:

a) How many grams ofNO2, nitrogen dioxide, are contained in 0.500 L of thegas at STP?

b) Calculate thedensity of NO2 gas, in grams per liter, at 110C and 12atm.

c) Calculate the molarmass of a gas if 0.125 g of the gas occupies 93.3 mL at STP.

d) On a spring morning(15C) you fill your tires to a pressure of 2.25 atmospheres. As youride along, the tire heats up to 45C from the friction on the road.What is the pressure in your tires now?

e) What volume ofH2 is formed at STP when 6.0 g of Al is treated withexcess NaOH?

2NaOH+ 2Al + 6H2O 2NaAl(OH)4 +3H2(g)

Application of Gas Law

a) Whatis the effect on the volume of an ideal gas when the temperature isdecreased from 700K to 350K at constant pressure?

b) Whatis the effect on the volume of an ideal gas when both the pressureand temperature are reduced by half?

c) Whatis the effect on the volume of an ideal gas when the pressure ischanged from 722 torr to 0.950 atm, and the temperature is changedfrom 5oC to 273 K?

Stoichiometric Relationships

a) Howmany grams of phosphorus react with 35.5 L of O2 at STPto form tetraphosphorus oxide, according to the following reactionequation?

P4 (s) + 5 O2 (g)P4O10 (s)

b) Ammonia decomposes to nitrogen and hydrogen when in thepresence of heated steel wool. What is thefinal volume of the gas when 45 g of ammonia decomposes at150oC and 1 atm pressure. Writea balanced equation before you start your calculations!

Daltons Law of Partial Pressures

a) A sample of a natural gas contains 8.24 moles of methane(CH4), 0.421 mole of ethane(C2H6), and 0.116 mole of propane(C3H8). If the totalpressure of the gases is 1.37 atm, what are the partial pressuresof the gases?

b) Earths atmosphere consist of 78% N2and 20%O2, and other gases. What is the partial pressure ofN2 and O2intorr, when the atmospheric pressure is 1 atm?

c) Ammonia is completely decomposed to nitrogen and hydrogen, asin question 9b). At the end of theexperiment the pressure of the gas mixture is 866mmHg. Calculate the partial pressures ofN2 and H2.

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