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Get Full Access to Chemistry: A Molecular Approach - 5 Edition - Chapter 19 - Problem 93
Get Full Access to Chemistry: A Molecular Approach - 5 Edition - Chapter 19 - Problem 93

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ISBN: 9780134874371 2047

## Solution for problem 93 Chapter 19

Chemistry: A Molecular Approach | 5th Edition

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Problem 93

These reactions are important in catalytic converters in automobiles. Calculate $$\Delta G^{\circ}$$ for each at 298 K. Predict the effect of increasing temperature on the magnitude of $$\Delta G^{\circ}$$.

a. $$2 \mathrm{CO}(g)+2 \mathrm{NO}(g) \longrightarrow \mathrm{N}_{2}(g)+2 \mathrm{CO}_{2}(g)$$

b. $$5 \mathrm{H}_{2}(g)+2 \mathrm{NO}(g) \longrightarrow 2 \mathrm{NH}_{3}(g)+2 \mathrm{H}_{2} \mathrm{O}(g)$$

c. $$2 \mathrm{H}_{2}(g)+2 \mathrm{NO}(g) \longrightarrow \mathrm{N}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(g)$$

d. $$2 \mathrm{NH}_{3}(g)+2 \mathrm{O}_{2}(g) \longrightarrow \mathrm{N}_{2} \mathrm{O}(g)+3 \mathrm{H}_{2} \mathrm{O}(g)$$

Text Transcription:

Delta G^circ

2 CO( g) + 2 NO( g) longrightarrow N2( g) + 2 CO2( g)

5 H2( g) + 2 NO( g) longrightarrow 2 NH3( g) + 2 H2O( g)

2 H2( g) + 2 NO( g) longrightarrow N2( g) + 2 H2O( g)

2 NH3( g) + 2 O2( g) longrightarrow N2O( g) + 3 H2O( g)

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Week One Topics Discussed • Significant Figures • General Rules of SFs • Mathematics with SFs • Exponential Notation • Prefixes • Accuracy and Precision Concepts in Measurement I. Significant Figures a. An exact number has an infinite number of significant figures i. Ex) 1 dozen=12, both integers have an infinite number of sig figs b. An inexact number has a definite number of significant figures i. π≈3.14 (3 sig figs) ii. π≈3.14159 (6 sig figs) c. The number of significant figures represents an exact value plus one (1) unit of uncertainty i. The average weight of a human baby is 7.5 pounds, where .5 is a unit of uncertainty II. General Rules of Significant Figures a. ALL Nonzero values are significant i. 3.7563 (5 sig figs) b. Zeros between nonzero values are significant i. 1894005 (7 sig figs) c. Zeros at the beginning are NOT significant i. 0.005 (1 sig fig) d. Zeros at the end are significant IF there is a decimal i. 0.0670 (3 sig figs) III. Calculating with Significant Figures a. Addition and Subtraction i. Answer has the same number of decimal places as the least precise value 1. 10.1g – 7.445g = 2.655g ≈ 2.7g

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