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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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
Transcribed Image Text:What are the signs for q and w if a system absorbs 180 J of heat energy while expanding against
constant pressure?
+q and -w
+ą and +w
-q and -w
-q and +w
3.
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- ||| Solving a basic calorimetry problem A sample of polystyrene, which has a specific heat capacity of 1.880 J.g¹.C¹, is put into a calorimeter (see sketch at right) that insulated contains 200.0 g of water. The polystyrene sample starts off at 92.7 °C and the temperature of the water starts off at 15.0 °C. When the temperature of the water stops changing it's 23.1 °C. The pressure remains constant at 1 atm. container Calculate the mass of the polystyrene sample. Be sure your answer is rounded to 2 significant digits. Me g x10 X thermometer. 5 water sample a calorimeterarrow_forwardUse the molar bond enthalpy data in the table to estimate Average molar bond enthalpies. (Hpond) the value of AHan for the equation Bond kJ. mol-1 Bond kJ. mol-1 CCI, (g) + 2F, (8) → CF,(g) + 2 CL,(g) O-H 464 C=N 890 0-0 142 N-H 390 The bonding in the molecules is shown. С-О 351 N-N 159 O=0 502 N=N 418 C=0 730 N=N 945 C CI С-С 347 F-F 155 C=C 615 Cl-CI 243 C=C 811 Br-Br 192 С-Н 414 H-H 435 C-F 439 H-F 565 C-Cl 331 H-CI 431 C-Br 276 H-Br 368 C-N 293 H-S 364 C=N | 615 S-S 225arrow_forwardWrite a balanced thermochemical expression depicting the formation of 1 mol of the compound below from it's elements. Note: ΔH∘fΔHf∘ for C6H12O6 (s) = -1274.4 kJ/mol 6 CO2 (g) + 6 H2O (l) ⟶⟶ C6H12O6 (s) + 6 O2 (g) ΔH∘ΔH∘ = -1274.4 kJarrow_forward
- Which of these shows the correct work to calculate the kJ of heat released if 50.0g of Al is reacted using the reaction below? A B C Darrow_forwardUse the molar bond enthalpy data in the table to estimate Average molar bond enthalpies. (Hpond) the value of AHn for the equation Bond kJ - mol-1 Bond kJ - mol-1 CCI, (g) + 2F, (g) CF,(g) + 2Cl, (g) O-H 464 C=N 890 The bonding in the molecules is shown. 0-0 142 N-H 390 С-О 351 N-N 159 CICI O=0 502 N=N 418 + C CI C=0 730 N=N 945 F-F С-С 347 F-F 155 C=C 615 Cl-CI 243 C=C 811 Br-Br 192 С-Н 414 Н-Н 435 C-F 439 Н-F 565 C-CI 331 Н-С 431 C-Br 276 Н-Br 368 C-N 293 H-S 364 C=N 615 S-S 225arrow_forwardA simple method for the laboratory preparation of hydrogen involves reaction of zinc with hydrochloric acid;Zn(s) + 2 HCl(aq) → ZnCl 2(aq) + H 2(g) ΔH = -152.5 kJ How much heat in kilojoules is evolved if a total of 1094 mL of H 2 was collected over water at 28.00 ° C and an atmospheric pressure of 275.7 mm Hg. The partial pressure of water at this temperature is 28.35 mm Hg? Assume heat evolved is directly proportional to the moles produced.arrow_forward
- Consider the following 2 reactions: 2A+B>2C -483.6KJ 3B>2D 284.6KJ determine the enthalpy change for the process: 3A+D>3Carrow_forward5. Use standard heats of formation and the following equation to determine the enthalpy of formation of C₂H() ΔΗ, = -3127 kJ 2C₂H6(g) +70₂(g) ⇒ 4CO2(g) + 6H₂O)arrow_forwardUsing the information provided along with an understanding of Hess's Law, determine the enthalpy of reaction for the unknown reaction. AFels) + 3Sn0,(s) → 2Fe,0,(s) +3Sn(s) 2Fe(s) +0, (s) - Fe;0,(s) A,H = -824.2 k) Sn{s) + 0,(g) - Sn02(s) AyH=-580.7 k/arrow_forward
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