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- Approximately how many atoms thick is a cell membrane, assuming all atoms there average about twice the size of a hydrogen atom?1. Suppose the amount of air in a person's lungs is 2.2 L, Calculate the number of moles of air molecules in the person’s lungs when the pressure there is atmospheric pressure. Note that the air is at 37.0°C (body temperature). 2. An expensive vacuum system can achieve a pressure as low as 1.05 × 10-7 Pa at 20°C, How many atoms are there in a cubic centimeter at this pressure and temperature?7. Calculate the mass of nitrogen present in a volume of 3000 cm' if the gas is at 22.0 °C and the absolute pressure of 2.03 ×10* Pa is a partial vacuum easily obtained in laboratories. (a) 6.95 ×10 kg; (b) 6.95 ×10* kg; (c) 6.95 ×1012 kg; (d) 6.95 ×10-16 kg. 8. Materials in which the electrons are bound very tightly to the nuclei and do not move freely are referred to as (a) Insulators; (b) Conductors; (c) Semiconductors .
- 1. An expensive vacuum system can achieve a pressure as low as 1 x 10-7N/m² at 20 °C. How many atoms are there in a cubic centimeter at this pressure and temperature? The Boltzman's constant k= 1.38 x 10 m²kg/(s²K) -23 Number of atoms:2. Why is the following situation impossible? A team of researchers discovers a new gas, which has a value of y = of 1.75.10:55 > t.myexams.unisa.ac.za MENU E Frag question A. 5.0 x 108 ft³ B. 6.0 x 108 ft³ C. 8.6 x 108 ft³ D. 2.1 x 108 ft³ E. 4.8 x 108 ft³ ||| Vol) 4G LTE2 T The largest building in the world by volume is the Boeing 747 plant in Everett, Washington. It measures approximately 650 m long, 710 yards wide, and 110 ft high. What is its volume in cubic feet? O 47 71% < myExams
- 5. Iron has molar mass 55.8 g/mol. (a) Find the volume of 1 mol of iron. (b) Use the value found in (a) to de- termine the volume of one iron atom. (c) Calculate the cube root of the atomic volume, to have an esti- mate for the distance between atoms in the solid. (d) Repeat the calculations for uranium, finding its molar mass in the periodic table of the elements in Appendix C.2. Consider two equal volumes of gas at a given temperature and pressure. One gas, oxygen, has a molecular mass of 32. The other gas, nitrogen, has a molecular mass of 28. What is the ratio of the number of oxygen molecules to the number of nitrogen molecules? A) 32.28 B) 28.32 C) 11 D) none of the above Answer Explanation 2021/12/11 08:262.) The escape velocity of any object from Earth is 11.1 km/s. At what temperature would oxygen molecules (with a molar mass M = 32.0 g/mol) have root-mean-square velocity vrms equal to Earth's escape velocity of 11.1 km Hint: Pay attention to dimensions/units and recall 1 kg-m? the Sl units for energy are the Joule (J), where 1J = s2
- 22. An ideal gas is trapped in a stationary container with the help of a piston and there is a small hole in the container through which the gas leaks If by heating the gas and simultaneously pushing the piston into container, temperature and pressure of the gas is increased to 4 times and 8 times respectively of their initial values, how many times does the rate of leakage of the gas (i.e. number of molecules leaking per second) change?1. Average atomic and molecular speeds (vrms) are large, even at low temperatures. What is vrms (in m/s) for helium atoms at 6.00 K, just two degrees above helium's liquefaction temperature? 2. The escape velocity from the Moon is much smaller than from Earth and is only 2.38 km/s. At what temperature (in K) would hydrogen molecules (molar mass is equal to 2.016 g/mol) have an average velocity vrms equal to the Moon's escape velocity? 3.Hydrogen molecules (molar mass is equal to 2.016 g/mol) have an average velocity vrms equal to 239 m/s. What is the temperature (in K)?5. True or false. In each case, explain your answer quantitativeły. Information that you might find useful: the escape speed from near Earth's surface is = 10*m/s. (a) Helium atoms on the surface of the Earth can escape into space. (b) Helium atoms moving at average speed on the surface of the Earth can escape into space. (c) On average, a Helium atom on the surface of the Earth moves faster than a nitrogen molecule.