A mixture of 7.8 mol of H₂ (g) and 3.9 mol of O₂ (g) is placed in a sealed evacuated container made of a perfect insulating material at 25 °C. The mixture is ignited with a spark and it reacts to form liquid water. [Cs (H₂O(1)) = 4.18 J/(g - °C), Cs (H₂O(g)) = 2.04 J/(g.° C)] H₂ (g) + O2 (g) → H₂O(1), _A,H° = −285.8 kJ/mol H₂O(l) → H₂O(g), A,H° = 44.01 kJ/mol Part A Find the temperature of the water. Express the temperature in degrees Celsius to two significant figures. Temperature = 15. ΑΣΦ ? °C

Chemistry: Principles and Practice
3rd Edition
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
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Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.24QE
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A mixture of 7.8 mol of H₂ (g) and 3.9 mol of O₂ (g) is placed in a sealed evacuated container made of a perfect
insulating material at 25 °C. The mixture is ignited with a spark and it reacts to form liquid water.
[Cs (H₂O(1)) = 4.18 J/(g°C), Cs (H₂O(g)) = 2.04 J/(g•° C)]
1
H₂(g) + O2(g) → H₂O(1), A, Hᵒ = -285.8 kJ/mol
H₂O(1)→ H₂O(g), A, H° = 44.01 kJ/mol
Part A
Find the temperature of the water.
Express the temperature in degrees Celsius to two significant figures.
Temperature =
ΨΕ ΑΣΦ
?
°C
Transcribed Image Text:A mixture of 7.8 mol of H₂ (g) and 3.9 mol of O₂ (g) is placed in a sealed evacuated container made of a perfect insulating material at 25 °C. The mixture is ignited with a spark and it reacts to form liquid water. [Cs (H₂O(1)) = 4.18 J/(g°C), Cs (H₂O(g)) = 2.04 J/(g•° C)] 1 H₂(g) + O2(g) → H₂O(1), A, Hᵒ = -285.8 kJ/mol H₂O(1)→ H₂O(g), A, H° = 44.01 kJ/mol Part A Find the temperature of the water. Express the temperature in degrees Celsius to two significant figures. Temperature = ΨΕ ΑΣΦ ? °C
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