Practice_EXAM_II

# 0ocisplacedflatonasheetofiron

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Unformatted text preview: a)); 9th ed. p.p. 192‐195.This question is taken from p. 212 (5.64 (a)). Total pressure = 0.32+0.15+0.42= 0.89 atm. 18. Nickel forms a gaseous compound of the formula Ni(CO)x. What is the value of x given the fact that under the same conditions of temperature and pressure, methane (CH4) effuses 3.3 times faster than the compound? (a) 1 (b) 2 (c) 3 (d) 4 (e) 5 Hint: 11th ed. p.p. 204‐209 Example 5.17; 10th ed. p.p. 208‐209 Example 5.17. This question is taken from p. 219 (5.84); 9th ed. p.p. 203‐204. Example 5.17. This question is taken from p. 213 (5.84). {rate of CH4 / rate of Ni(CO)x} = Square root of {molar mass of CH4 / molar mass of Ni(CO)x} = 3.3/ 1 = Take square at the both side rate of CH4 / rate of Ni(CO)x = 10.89 rate of Ni(CO)x = 16 x 10.89 = 174.24 = 58.69 + 28x x = {(174.24 – 58.69)/28} = 4.1267 Round to whole number = 4 19. What is the change in energy (J) of the gas when a gas expends and does P‐V work on the surroundings equal to 325 J and at the same time absorbs 127 J of heat from the surroundings? (a) ‐198 (b) + 198 (c) + 157 (d) ‐157 (e) + 452 Hint: 11th ed. p. 239 Example 6.2 table 6.1; 10th ed. p. 238: Example 6.2; 9th ed. p. 232: Example 6.2. 20. Consider the reaction below: 2CH3OH(l) + 3O2(g) 4H2O(l...
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