2009 Midterm

# 00 0200 0800 moles of n2 g 3100 0200 2400 moles

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Unformatted text preview: les of H2 (g). The reaction mixture after one reaction step: (1.00-0.200) = 0.800 moles of N2 (g); 3*(1.00-0.200)= 2.400 moles of H2 (g); 2* 0.200 = 0.400 moles of NH3 (g). Total number of moles after the step is 3.600. The mole fraction of N2 (g) after the reaction step is 0.800/3.600 = 0.222 (3 significant figures). Chemistry 1024b, Winter 2009 Midterm Exam with Solutions Page 9 out of 9 24. Consider one mole of Cl2 gas and one mole of H2 gas at a pressure of 101 kPa and room temperature. Which of the following statements is correct? A) The volume occupied by one mole of Cl2 will be always greater than that of one mole of H2 because the molecule of Cl2 is larger than the molecule of H2 and there is the same number of molecules in one mole of any gas. 100 watermelons occupy a larger volume than 100 apples! B) These gases will occupy the same volume because in these conditions the size of the molecules is negligible as compared to the distances between them. The ideal gas law will apply, which says that one mole of all ideal gases occupies the same volume at a given temperature and pressure. C) The volume occupied by one mole of Cl2 will be smaller than that of one mole of H2 because the Cl2 molecules have a higher molecular weight and thus the average speed of Cl2 molecules at a given temperature will be lower. Therefore, they will occupy a smaller volume. D) The volume occupied by one mole of Cl2 will be greater than that of one mole of H2 because the Cl2 molecules have a higher molecular weight and thus the average speed of Cl2 molecules at a given temperature will be higher. Therefore, they will occupy a greater volume. E) None of the above. 25. Consider the same one mole of Cl2 gas and one mole of H2 gas but now at a pressure of 50 GPa and room temperature. Which of the following statements is correct? A) The volume occupied by one mole of Cl2 will be always greater than that of one mole of H2 because the molecule of Cl2 is larger than the molecule of H2 and the...
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