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The freezing point of mercury is -38.8 °C. What quantity of energy in joules is released to the surroundings if 1.00 ml of mercury is cooled from 23.0 °C to -38.8 °C and then frozen to a solid?

The freezing point of mercury is -38.8 °C. What quantity of energy in joules is released to the surroundings if 1.00 ml of mercury is cooled from 23.0 °C to -38.8 °C and then frozen to a solid?

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 90GQ: Water gas, a mixture of carbon monoxide and hydrogen, is produced by treating carbon (in the form of...
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QUESTION 5: The freezing point of mercury is -38.8 °C. What quantity of energy in joules is released to the surroundings if 1.00 ml of mercury is cooled from 23.0 °C to -38.8 °C and then frozen to a solid? QUESTION 6: Isooctane burns in air to give water and carbon dioxide (A.H° = -10 992kJ/mol-rxn). What is the enthalpy change if you burn 1.00 L of isooctane? QUESTION 7: Describe how you would prepare a buffer solution from NaH;PO. and NazHPO, to have a pH of 7.5. QUESTION 8: Equal molar quantities of sodium hydroxide and sodium hydrogen phosphate are mixed. a) Write the balanced, net ionic equation for the acid base reaction that can in principle occur. b) Does the equilibrium lie to the left or right? QUESTION 9: Sodium cyanide is the salt of the weak acid HCN. Calculate the concentration of H30* ; OH ; HCN and Na" in solution prepared by dissolving 10.8 g of NaCN in enough water to make 5.00 x 10° mL of solution at 25 °C. QUESTION 10: Hydrazine N2H4 can interact with water in two steps N2H4 (aq) + H20 (I) + N2H5* (aq) + OH (aq) Ko1 = 8.5 x 107 N;Hs (aq) + H;0 (1) +→ N;Hc* (aq) + OH (ag) Ka2 = 8.9 x 1016 a) What is the concentration of OH" ; N;H;" ; and N2H* in a 0.010 M solution of hydrazine? b) What is the pH of the 0.010 M solution of hydrazine?
Transcribed Image Text:QUESTION 5: The freezing point of mercury is -38.8 °C. What quantity of energy in joules is released to the surroundings if 1.00 ml of mercury is cooled from 23.0 °C to -38.8 °C and then frozen to a solid? QUESTION 6: Isooctane burns in air to give water and carbon dioxide (A.H° = -10 992kJ/mol-rxn). What is the enthalpy change if you burn 1.00 L of isooctane? QUESTION 7: Describe how you would prepare a buffer solution from NaH;PO. and NazHPO, to have a pH of 7.5. QUESTION 8: Equal molar quantities of sodium hydroxide and sodium hydrogen phosphate are mixed. a) Write the balanced, net ionic equation for the acid base reaction that can in principle occur. b) Does the equilibrium lie to the left or right? QUESTION 9: Sodium cyanide is the salt of the weak acid HCN. Calculate the concentration of H30* ; OH ; HCN and Na" in solution prepared by dissolving 10.8 g of NaCN in enough water to make 5.00 x 10° mL of solution at 25 °C. QUESTION 10: Hydrazine N2H4 can interact with water in two steps N2H4 (aq) + H20 (I) + N2H5* (aq) + OH (aq) Ko1 = 8.5 x 107 N;Hs (aq) + H;0 (1) +→ N;Hc* (aq) + OH (ag) Ka2 = 8.9 x 1016 a) What is the concentration of OH" ; N;H;" ; and N2H* in a 0.010 M solution of hydrazine? b) What is the pH of the 0.010 M solution of hydrazine?
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