Styrene (C8H8, FW 104.15) is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of formation of styrene at 25°C. (Given: Hf°[CO2(g)] = –393.5 kJ/mol, Hf°[H2O(l)] = –285.8 kJ/mol, Hf°[H2O(g)] = –241.8 kJ/mol) A) 147.8 kJ/mol B) 323.8 kJ/mol C) -636.7 kJ/mol D) -4249 kJ/mol E) -8730 kJ/mol
Styrene (C8H8, FW 104.15) is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of formation of styrene at 25°C. (Given: Hf°[CO2(g)] = –393.5 kJ/mol, Hf°[H2O(l)] = –285.8 kJ/mol, Hf°[H2O(g)] = –241.8 kJ/mol) A) 147.8 kJ/mol B) 323.8 kJ/mol C) -636.7 kJ/mol D) -4249 kJ/mol E) -8730 kJ/mol
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter15: Energy And Chemical Change
Section: Chapter Questions
Problem 112A: sample of natural gas is analyzed and found to be88.4% methane (CH4) and 11.6% ethane (C2H6) bymass....
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Question
Styrene (C8H8, FW 104.15) is one of the substances used in the production of synthetic rubber. When
styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at
25°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of formation of styrene at
25°C.
(Given: Hf°[CO2(g)] = –393.5 kJ/mol, Hf°[H2O(l)] = –285.8 kJ/mol,
Hf°[H2O(g)] = –241.8 kJ/mol)
A) 147.8 kJ/mol
B) 323.8 kJ/mol
C) -636.7 kJ/mol
D) -4249 kJ/mol
E) -8730 kJ/mol
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