From the data given in Exercise 72, estimate a value of r S at 298 K

Question:

From the data given in Exercise 72, estimate a value of ΔrS° at 298 K for the reaction

2 NaHCO3(s) Na2CO3(s) + HO(g) + CO2(g)

Exercise 72

Sodium carbonate, an important chemical used in the production of glass, is made from sodium hydrogen carbonate by the reaction

2 NaHCO3(s) - NaCO3(s) + CO(g) + HO(g)

Data for the temperature variation of K for this reaction are K = 1.66 x 10-5 at 30 °C; 3.90 x 10-4 at 50 °C; 6.27 x 10-3 at 70 °C; and 2.31 x 10-1 at 100 °C.

(a) Plot a graph similar to Figure 13-10, and determine ΔrH° for the reaction.

(b) Calculate the temperature at which the total gas pressure above a mixture of NaHCO3(s) and Na2CO3(s) is 2.00 bar.

Figure 13-10

In K 8.0- 6.0 - 4.0- 2.0- 0.0- -2.0- -4.0 1 8.0 Slope= I 9.0 3.4 x 10-4K-1 7.6 3.4 x 10-4K- 1 10.0 11.0 I/T,

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Related Book For  book-img-for-question

General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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