Explanation Electrode M n O 2 ( s ) | | M n + 2 ( a q ) Standard electrode potential of electrode is E M n O 2 ( s ) / M n + 2 ( a q ) º = +1.21 V The value of pH is 10.24. The half-cell reaction is M n O 2 ( s ) + 4 H + ( a q ) + 2 e − → M n 2 + ( a q ) + 2 H 2 O ( l ) As per the Nernst equation E M n O 2 / M n + 2 = E M n O 2 / M n + 2 º − 0.0592 V n log Q .............. ( 1 ) E M n O 2 / M n + 2 = E M n O 2 / M n + 2 º = 0.0592 V n log [ M n + 2 ] [ H + ] 4 .............. ( 2 ) We have to calculate M n 2 + at which electrode potential will be 0 V. Standard electrode potential of electrode is E M n O 2 ( s ) / M n + 2 ( a q ) º = +1.21 V Desired electrode potential is E M n O 2 ( s ) / M n + 2 º = 0.00 V After substituting values 0

Mastering Chemistry with Pearson eText -- Standalone Access Card -- for Chemistry: A Molecular Approach (4th Edition)

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ISBN: 9780134162485

Author: Nivaldo J. Tro

Publisher: PEARSON

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Chapter 19, Problem 129E

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Interpretation: The [Mn²⁺] is to be calculated which is necessary to lower the potential of the half-cell to 0.00 V.

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Chapter 19, Problem 128E

Chapter 19, Problem 130E

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4. Nitrogen gas is commonly sold in 49.0 L steal cylinders at a pressure of 150 atm. (a) How many moles of nitrogen are in the container if the temperature of the cylinder is 21°C. (b) How many moles of nitrogen will there be if the container above is heated to 100°C? (careful here) (c) What is the mass of nitrogen gas in the cylinder in part (a)? (d) What volume would the nitrogen occupy at 21°C, if the pressure was reduced to 1.02 atm? (e) What would be the pressure of the nitrogen gas in the cylinder when the temperature is raised to 39°C?

6. A 0.4550 g sample of an unknown organic compound with the empirical formula CH2O was placed into a 150.0 ml vessel and was vaporized into a gas. At 175.0°C, the pressure of the vaporized compound was measured at 941.1 torr. (a) Determine the molar mass of the compound (b) Determine the molecular formula of the compound.

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Mastering Chemistry with Pearson eText -- Standalone Access Card -- for Chemistry: A Molecular Approach (4th Edition)

Ch. 19 - Prob. 1SAQ Ch. 19 - Q2. Which statement is true for voltaic cells? a)...Ch. 19 - Prob. 3SAQ Ch. 19 - Prob. 4SAQ Ch. 19 - Prob. 5SAQ Ch. 19 - Prob. 6SAQ Ch. 19 - Prob. 7SAQ Ch. 19 - Prob. 8SAQ Ch. 19 - Prob. 9SAQ Ch. 19 - Prob. 10SAQ

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The [Mn 2+ ] is to be calculated which is necessary to lower the potential of the half-cell to 0.00 V.

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Interpretation: The [Mn2+] is to be calculated which is necessary to lower the potential of the half-cell to 0.00 V.

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Chapter 19 Solutions

Interpretation: The [Mn²⁺] is to be calculated which is necessary to lower the potential of the half-cell to 0.00 V.