Answered: Consider the following data. 2…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Related questions

Question

Consider the following data.

2 HF(g)(equilibrium arrow) H2(g) + F2(g) H = +537 kJ
C(s) + 2 F2(g)(equilibrium arrow) CF4(g) H = -680 kJ
C2H4(g)(equilibrium arrow) 2 C(s) + 2 H2(g) H = -52.3 kJ

Use Hess's law to calculate H for the reaction below.

2 CF₄(g) + 4 HF(g)(equilibrium arrow) C₂H₄(g) + 6 F₂(g)

H = _____ kJ

Expert Solution

Step 1

The given reaction is,

$2 C F_{4} (g) + 4 H F (g) \Leftrightarrow C_{2} H_{4} (g) + 6 F_{2} (g)$

The steps for the given reaction are,

2HF(g) $\Leftrightarrow$ H₂(g) + F₂(g) H₁ = +537 kJ ..............(1)
C(s) + 2 F₂(g) $\Leftrightarrow$ CF₄(g) H₂ = -680 kJ ...............(2)
C₂H₄(g) $\Leftrightarrow$ 2C(s) + 2 H₂(g) H₃ = -52.3 kJ ............(3)