| 1.3 | 1.4 | 1.5 | 1.6 | 1.7 |
| 1.8 | 1.9 | 1.10 | 1.11 | 1.12 |
1.1. Hemoglobin is the protein that transports O2 through the blood from the lungs to the rest of the body. In doing so, each molecule of hemoglobin combines with four molecules of O2. If 1.00 g of hemoglobin combines with 1.53 mL of O2 at 37°C and 743 torr, what is the molar mass of hemoglobin?
1.2. In preparation for a combustion demonstration, a professor’s assistant fills a balloon with equal molar amounts of H2 and O2, but the demonstration has to be postponed until the next day. During the night, both gases leak through pores in the balloon. If 45% of the H2 leaks, what is the O2/H2 ratio in the balloon the next day?
1.3. At given temperature and pressure which of the following gases has the highest the most probable speed of its molecules:
A) Chlorine B) Nitrogen C) Oxygen D) Neon E) Fluorine
1.4. Uranium is converted to gaseous UF6 and pumped through a series of chambers with porous barriers to separate non-fissionable isotope of uranium 238U from fissionable 235U. Calculate the ratio of rates 235UF6 and 238UF6.
A) 1.5003 B) 1.7987 C) 2.876 D) 1.0043 E) None of these choices is correct
1.5. A 6.0-L flask contains a mixture of methane, argon, and helium at 45°C and 1.75 atm. If the mole fractions of helium and argon are 0.25 and 0.35, respectively, how many molecules of methane are present?
A) 0.97×1023 B) 6.02×1023 C) 0.30×10-23 D) 7.03×10-12 E) None of these choices is correct
1.6. A large portion of metabolic energy arises from the biological combustion of glucose: If this reaction is carried out in an expandable container at 35°C and 780.0 torr, what volume (in m3) off carbon dioxide is produced from 18.0 g of glucose and excess O2?
A) 0.970 B) 6.896 C) 0.015 D) 7.038 E) None of these choices is correct
1.7. Calculate the change in energy (ΔE) of a system (in kcal) when expanding gases do 451 J of work on the pistons in a car engine, and the system loses 325 J to the surroundings as heat.
A) 12.34 B) -0.90 C) 0.90 D) 105.32 E) None of these choices is correct
1.8. Find the heat (in kJ) transferred when 5.50 L of ethylene glycol (d = 1.11 g/mL; c = 2.42 J/g·K) in a car radiator cools from 37.0°C to 25.0°C.
A) 150 B) -177 C) -150 D) 15 E) None of these choices is correct
1.9. Rydberg equation was found to predict the wavelength of any line at the spectrum of atomic hydrogen. Calculate wavelength (in nm) of the spectral line emitted as the electron moves from the second to the first exited (first is n = 2, and n = 1 is considered as ground state) state. (Rydberg constant is equal to 1.096776×107 m -1)
A) 486 B) 145 C) 656 D) 45 E) None of these choices is correct
1.10. Find heat released (in J) when 2.50 mol sample of gaseous water in closed container with pressure kept at 1 atm cools in the following manner: H2O(g) [130°C] → H2O(g) [100°C]. The molar heat capacity of gaseous water is 33.1J/mol K
A) -2482 B) 434 C) -6560 D) 4100 E) None of these choices is correct
1.11. For structures consisting of identical atoms, how many atoms are contained in the simple cubic unit cells?
A) 2 B)3 C) 4 D) 1 E) None of these choices is correct
1.12. In a study of the chemistry of glass etching, an inorganic chemist examines the reaction between sand (SiO2) and hydrogen fluoride at a temperature above the boiling point of water:
SiO2(s) + 4HF(g) ↔ SiF4(g) + 2H2O(g)
Predict in which direction will the reaction proceed and the effect on [SiF4] when H2O (g) is removed;
A) to the right and [SiF4] increases B) to the right and [SiF4] decreases C) to the left and [SiF4] increases D) to the left and [SiF4] decreases E) None of these choices is correct
| 1.3 | 1.4 | 1.5 | 1.6 | 1.7 |
| 1.8 | 1.9 | 1.10 | 1.11 | 1.12 |
1.1. In preparation for a combustion demonstration, a professor’s assistant fills a balloon with equal molar amounts of H2 and O2, but the demonstration has to be postponed until the next day. During the night, both gases leak through pores in the balloon. If 45% of the H2 leaks, what is the O2/H2 ratio in the balloon the next day?
1.2. Hemoglobin is the protein that transports O2 through the blood from the lungs to the rest of the body. In doing so, each molecule of hemoglobin combines with four molecules of O2. If 1.00 g of hemoglobin combines with 1.53 mL of O2 at 37°C and 743 torr, what is the molar mass of hemoglobin?
1.3. At given temperature and pressure which of the following gases has the lowest the most probable speed of its molecules:
A) Chlorine B) nitrogen C) oxygen D) Neon E) Fluorine
1.4. Calculate the ratio of rates of 238UF6 and 239PuF6 upon pumping through a series of chambers with porous barriers.
A) 1.5203 B) 1.3987 C) 1.0014 D) 2.1043 E) None of these choices is correct
1.5. A 6.0-L flask contains a mixture of methane, argon, and helium at 45°C and 1.75 atm. If the mole fractions of methane and argon are 0.40 and 0.35, respectively, how many molecules of helium are present?
A) 4.05×1012 B) 0.60×1023 C) 0.30×10-23 D) 7.03×10-2 E) None of these choices is correct
1.6. A large portion of metabolic energy arises from the biological combustion of glucose:
If this reaction is carried out in an expandable container at 35°C and 780 mmHg, what volume (in m3) of carbon dioxide is produced from 0.018 kg of glucose and excess O2?
A) 0.970 B) 6.896 C) 0.150 D) 7.038 E) None of these choices is correct
1.7. Calculate the change in energy (ΔE) of a system (in kcal) when expanding gases do 400 J of work on the pistons in a car engine and the system loses 376 J to the surroundings as heat.
A) 18.78 B) 0.90 C) -0.90 D) 10.23 E) None of these choices is correct
1.8. Find the heat (in kJ) transferred when 5.50 L of ethylene glycol (d = 1.11 g/mL; c = 2.42 J/g K) in a car radiator cools from 39.0°C to 27.0°C.
A) -15 B) 15 C) 150 D) -177 E) None of these choices is correct
1.9. Rydberg equation was found to predict the wavelength of any line at the spectrum of atomic hydrogen. Calculate wavelength (in nm) of the spectral line emitted as the electron moves from the third to the first exited state (first is n = 2, and n = 1 is considered as ground state). (Rydberg constant is equal to 1.096776×107 m-1)
A) 486 B) 434 C) 656 D) 45 E) None of these choices is correct
1.10. Find heat released (in kJ) when 2.50 mol sample of gaseous water in closed container with pressure kept at 1 atm cools the following manner: H2O(g) [100°C] → H2O(l) [100°C]. The heat of vaporization of water (ΔH°vap at 100°C) is 40.7 kJ/mol K.
A) 180 B) -102 C) -656 D) 410 E) None of these choices is correct
1.11. For structures consisting of identical atoms, how many atoms are contained in the body-centered cubic unit cells?
A) 2 B) 3 C) 4 D) 1 E) None of these choices is correct
1.12. In a study of the chemistry of glass etching, an inorganic chemist examines the reaction between sand (SiO2) and hydrogen fluoride at a temperature above the boiling point of water:
SiO2(s) + 4HF(g) ↔ SiF4(g) + 2H2O(g)
Predict in which direction will the reaction proceed and the effect on [SiF4] when some liquid water is added;
A) to the right and [SiF4] increases B) to the right and [SiF4] decreases C) to the left and [SiF4] increases D) to the left and [SiF4] decreases E) None of these choices is correct
