CHEMISTRY >CUSTOM<
CHEMISTRY >CUSTOM<
8th Edition
ISBN: 9781309097182
Author: SILBERBERG
Publisher: MCG/CREATE
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Chapter 22, Problem 22.61P

(a)

Interpretation Introduction

Interpretation:

The equilibrium constant Kp for the two given ammonia oxidations has to be calculated.

(a)

Expert Solution
Check Mark

Explanation of Solution

For the first reaction (1):

    4NH3(g) + 5O2(g) pt/Rhcatalyst4NO(g) + 6H2O(g)ΔG25o=-906.196 kJ-[(273 + 25)K]( 0.17792 kJ/K)=-959.216 kJΔG900o=-906.196 kJ-[(273 + 900)K]( 0.17792 kJ/K)=-1114.896kJ

For the first reaction (2):

    4NH3(g) + 3O2(g) 2N2(g) + 6H2O(g)ΔG25o=-1267.356 kJ-[(273 + 25)K]( 0.12832 kJ/K)=-1305.595 kJΔG900o=-1267.356 kJ-[(273 + 900)K]( 0.12832 kJ/K)=-1417.875 kJ.

At 25oC, the equilibrium constant is calculated as,

    ΔGοrxn=-RTlnKclnK25(1)=ΔGοrxn-RT=-959.216 kJ/mol(8.314 K/mol.K)(298k)(1000J1KJ)=387.15977K25(1)=1x10168lnK25(2)=ΔGοrxn-RT=-1305.595 kJ/mol(8.314 K/mol.K)(298k)(1000J1KJ)=526.9655K25(2)=7x10228

(b)

Interpretation Introduction

Interpretation:

The equilibrium constant Kp for the two given ammonia oxidations has to be calculated.

(b)

Expert Solution
Check Mark

Explanation of Solution

At 900oC, the equilibrium constant is calculated as,

    ΔGοrxn=-RTlnKclnK900(1)=ΔGοrxn-RT=-1114.896 kJ/mol(8.314 K/mol.K)(298k)(1000J1KJ)=114.3210817K900(1)=4.6x1049lnK900(2)=ΔGοrxn-RT=-1417.875 kJ/mol(8.314 K/mol.K)(298k)(1000J1KJ)=145.388K900(2)=1.4x1063

(c)

Interpretation Introduction

Interpretation:

The annual cost of the lost platinum has to be calculated.

(c)

Expert Solution
Check Mark

Explanation of Solution

The annual cost of the lost platinum is calculated as,

    Cost ($) Pt =(1.01x107 t HNO3)(175 mg Pt1t HNO3)(0.001g1mg)(1kg1000g) (32.15 Troy Oz1kg)($15571 troy oz) =$8.8x107

(d)

Interpretation Introduction

Interpretation:

The value of the platinum captured by a recovery unit with 72% efficiency has to be calculated.

(d)

Expert Solution
Check Mark

Explanation of Solution

The value of the platinum captured by a recovery unit is calculated as,

    Cost ($) Pt =(1.01x107 t HNO3)(175 mg Pt1t HNO3)(72%100%)(0.001g1mg)(1kg1000g) (32.15 Troy Oz1kg)($15571 troy oz) =$6.4x107

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Chapter 22 Solutions

CHEMISTRY >CUSTOM<

Ch. 22 - Prob. 22.11PCh. 22 - Prob. 22.12PCh. 22 - Prob. 22.13PCh. 22 - Prob. 22.14PCh. 22 - Prob. 22.15PCh. 22 - Prob. 22.16PCh. 22 - Prob. 22.17PCh. 22 - Prob. 22.18PCh. 22 - Define: (a) ore; (b) mineral; (c) gangue; (d)...Ch. 22 - Define: (a) roasting; (b) smelting; (c) flotation;...Ch. 22 - What factors determine which reducing agent is...Ch. 22 - Prob. 22.22PCh. 22 - Prob. 22.23PCh. 22 - Prob. 22.24PCh. 22 - Prob. 22.25PCh. 22 - Prob. 22.26PCh. 22 - Prob. 22.27PCh. 22 - Why is cryolite used in the electrolysis of...Ch. 22 - Prob. 22.29PCh. 22 - How is Le Châtelier’s principle involved in the...Ch. 22 - Elemental Li and Na are prepared by electrolysis...Ch. 22 - A Downs cell operating at 77.0 A produces 31.0 kg...Ch. 22 - Prob. 22.33PCh. 22 - Prob. 22.34PCh. 22 - The last step in the Dow process for the...Ch. 22 - Prob. 22.36PCh. 22 - Prob. 22.37PCh. 22 - Prob. 22.38PCh. 22 - Prob. 22.39PCh. 22 - Prob. 22.40PCh. 22 - Prob. 22.41PCh. 22 - Prob. 22.42PCh. 22 - Prob. 22.43PCh. 22 - Prob. 22.44PCh. 22 - Prob. 22.45PCh. 22 - Prob. 22.46PCh. 22 - Prob. 22.47PCh. 22 - Prob. 22.48PCh. 22 - Prob. 22.49PCh. 22 - Prob. 22.50PCh. 22 - Prob. 22.51PCh. 22 - Prob. 22.52PCh. 22 - Prob. 22.53PCh. 22 - Prob. 22.54PCh. 22 - Prob. 22.55PCh. 22 - Prob. 22.56PCh. 22 - Prob. 22.57PCh. 22 - Prob. 22.58PCh. 22 - Prob. 22.59PCh. 22 - In the production of magnesium, Mg(OH)2 is...Ch. 22 - Prob. 22.61PCh. 22 - Prob. 22.62PCh. 22 - The production of S8 from the H2S(g) found in...Ch. 22 - Prob. 22.64PCh. 22 - Prob. 22.65PCh. 22 - Prob. 22.66PCh. 22 - Prob. 22.67PCh. 22 - Prob. 22.68PCh. 22 - Prob. 22.69PCh. 22 - Prob. 22.70PCh. 22 - Prob. 22.71PCh. 22 - Prob. 22.72PCh. 22 - Prob. 22.73PCh. 22 - Prob. 22.74PCh. 22 - Prob. 22.75PCh. 22 - Prob. 22.76PCh. 22 - Prob. 22.77PCh. 22 - Prob. 22.78PCh. 22 - Prob. 22.79PCh. 22 - Prob. 22.80PCh. 22 - Prob. 22.81PCh. 22 - Prob. 22.82PCh. 22 - Prob. 22.83PCh. 22 - Prob. 22.84PCh. 22 - Prob. 22.85PCh. 22 - Prob. 22.86P
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