Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN: 9781337398909
Author: Lawrence S. Brown, Tom Holme
Publisher: Cengage Learning
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Chapter 13, Problem 13.106PAE

13.106 Hydrazine, N 2 H 4 , has been proposed as the fuel in a fuel cell in which oxygen is the oxidizing agent. The reactions are

   N 2 H 4 ( aq ) + 4 OH - ( aq ) N 2 ( g ) + 4 H 2 O ( l ) + 4 e O 2 ( g ) + 2 H 2 O ( l ) + 4 e 4 OH - ( aq )

(a) Which reaction occurs at the anode and which at the cathode?

(b) What is the net cell reaction?

(C) If the cell is to produce 0.50 A of current for 50.0 h, what mass in grams of hydrazine must be present?

(d) What mass in grams of O 2 must be available to react with the mass of N 2 H 4 determined in part (c)?

(b)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

To identify the net reaction.

Concept introduction:

  • The net reaction is the total reaction including all reactants and products.
  • It is obtained via addition of the half reactions.

Answer to Problem 13.106PAE

Solution:

Chemistry for Engineering Students, Chapter 13, Problem 13.106PAE , additional homework tip  1

Explanation of Solution

In order to find out the reaction, we must include the reduction-oxidation reactions. They always take place together, since one donates electrons and the other receives them.

In this case, the oxidation reaction: hydrazine oxidation to nitrogen gas. The reduction is oxygen forming hydroxide ion via the addition of electron

Adding both reactions, getting rid of repeating/same units on the left/right side of the equation:

Chemistry for Engineering Students, Chapter 13, Problem 13.106PAE , additional homework tip  2

Therefore, the reaction taking place is:

Chemistry for Engineering Students, Chapter 13, Problem 13.106PAE , additional homework tip  3

(c)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

To calculate the mass of hydrazine present in given amount of time and current.

Concept introduction:

  • A stands for ampere, the amount of current.
  • Time and current can be used to calculate total charge.
  • The total charge relates mol of e- and Faraday constant.

Answer to Problem 13.106PAE

Solution:

7.46g

Explanation of Solution

This consist of the following steps:

1st Step: Calculate the total amount of charge.

t=50.0 h=50 h×3600sh=180,000 sI=0.50A=0.50C/sq=I×t=0.50C/s×180,000 s=90,000C1mol e-=96500 Cxmol e-=90000 Cx=0.9326 mol e-

2nd Step: Calculate the total amount of moles of hydrazine

mol e-=1mol N2H40.9326mol e-=ymol N2H4y=0.2332mol N2H4

3rd Step: Calculate the mass of hydrazine

massN2H4=mol×MolarMass=0.2332 mol×32.0 g/mol=7.46g

(d)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

To calculate the mass oxygen required

Concept introduction:

  • Use stoichiometric ratios.

Answer to Problem 13.106PAE

Solution:

massO2=7.46g

Explanation of Solution

Relate the moles of oxygen and hydrazine:

1st Step: Calculate total moles of oxygen required

The ratio is 1:1 since 1 mol of hydrazine requires 1 mol of Oxygen gas to react.

Chemistry for Engineering Students, Chapter 13, Problem 13.106PAE , additional homework tip  4

2nd Step: Calculate the total mass of oxygen gas

massO2=mol×MolarMass=0.2332 mol×32.0 g/mol=7.46g

The mass is exactly the same as hydrazine since they have 1:1 ratio and similar molar masses.

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Chapter 13 Solutions

Chemistry for Engineering Students

Ch. 13 - Prob. 13.1PAECh. 13 - Prob. 13.2PAECh. 13 - Prob. 13.3PAECh. 13 - Prob. 13.4PAECh. 13 - For the following oxidationreduction reactions,...Ch. 13 - Which half-reaction takes place at the anode of an...Ch. 13 - If a salt bridge contains KNO3 as its electrolyte,...Ch. 13 - If a salt bridge contains KNO3 as its electrolyte,...Ch. 13 - The following oxidationreduction reactions are...Ch. 13 - Write a balanced chemical equation for the overall...Ch. 13 - For the reactions in parts (a) and (b) in the...Ch. 13 - Explain why the terms cell potential and...Ch. 13 - How does galvanic corrosion differ from uniform...Ch. 13 - Prob. 13.14PAECh. 13 - A student who has mercury amalgam fillings in some...Ch. 13 - Based on the cell potential measured for the cells...Ch. 13 - Prob. 13.17PAECh. 13 - Four voltaic cells are set up. In each, one...Ch. 13 - In tables of standard reduction potentials that...Ch. 13 - In the table of standard reduction potentials,...Ch. 13 - Using values from the table of standard reduction...Ch. 13 - Using values from the table of standard reduction...Ch. 13 - One half-cell in a voltaic cell is constructed...Ch. 13 - Four metals, A, B, C, and D, exhibit the following...Ch. 13 - Use the Nernst equation to calculate the cell...Ch. 13 - One half-cell in a voltaic cell is constructed...Ch. 13 - We noted that a tin-plated steel can corrodes more...Ch. 13 - The following half-cells are available: Ag(s);...Ch. 13 - Prob. 13.29PAECh. 13 - Prob. 13.30PAECh. 13 - In May 2000, a concrete pedestrian walkway...Ch. 13 - Prob. 13.32PAECh. 13 - Calculate the standard free energy change for the...Ch. 13 - Suppose that you cannot find a table of standard...Ch. 13 - Prob. 13.35PAECh. 13 - Which of the following reactions is (are)...Ch. 13 - Consult a table of standard reduction potentials...Ch. 13 - The equilibrium constant for a reaction is 31015...Ch. 13 - Some calculators cannot display results of an...Ch. 13 - Calculate the equilibrium constant for the...Ch. 13 - Use the standard reduction potentials for the...Ch. 13 - Hydrogen peroxide is often stored in the...Ch. 13 - Calculate the equilibrium constant for the redox...Ch. 13 - An engineer is assigned to design an...Ch. 13 - A magnesium bar with a mass of 6.0 kg is attached...Ch. 13 - Prob. 13.46PAECh. 13 - Prob. 13.47PAECh. 13 - Prob. 13.48PAECh. 13 - Prob. 13.49PAECh. 13 - If you put a 9-volt battery in a smoke detector in...Ch. 13 - If alkaline batteries were not alkaline but rather...Ch. 13 - What would happen to the voltage of an alkaline...Ch. 13 - What product forms from the lead components of a...Ch. 13 - Prob. 13.54PAECh. 13 - Prob. 13.55PAECh. 13 - Assume the specifications of a Ni-Cd voltaic cell...Ch. 13 - Prob. 13.57PAECh. 13 - What is the difference between active and passive...Ch. 13 - Prob. 13.59PAECh. 13 - Prob. 13.60PAECh. 13 - In an electroplating operation, the cell potential...Ch. 13 - Prob. 13.62PAECh. 13 - Prob. 13.63PAECh. 13 - Prob. 13.64PAECh. 13 - Use the Internet to find electroplating companies...Ch. 13 - Prob. 13.66PAECh. 13 - If a current of 15 A is run through an...Ch. 13 - Suppose somebody in a laboratory doesn't quite...Ch. 13 - If a barrel plating run uses 200.0 A for exactly 6...Ch. 13 - An electrical engineer is analyzing an...Ch. 13 - In a copper plating experiment in which copper...Ch. 13 - A metallurgist wants to gold-plate a thin sheet...Ch. 13 - Tin-plated steel is used for "tin" cans. Suppose...Ch. 13 - An electrolysis cell for aluminum production...Ch. 13 - If a plating line that deposits nickel (from NiCl2...Ch. 13 - Prob. 13.76PAECh. 13 - Prob. 13.77PAECh. 13 - A small part with a surface area of 2.62 cm2 is...Ch. 13 - An engineer is designing a mirror for an optical...Ch. 13 - Prob. 13.80PAECh. 13 - Prob. 13.81PAECh. 13 - What characteristic of lithium ions makes it...Ch. 13 - Looking at Figure 13.23, describe how the...Ch. 13 - Prob. 13.84PAECh. 13 - What is the role of a salt bridge in the...Ch. 13 - Prob. 13.86PAECh. 13 - If the SHE was assigned a value of 3.00 V rather...Ch. 13 - Prob. 13.88PAECh. 13 - Prob. 13.89PAECh. 13 - A chemical engineering student is studying the...Ch. 13 - Prob. 13.91PAECh. 13 - If a logarithmic scale had not been used for the...Ch. 13 - Battery manufacturers often assess batteries in...Ch. 13 - Prob. 13.94PAECh. 13 - Prob. 13.95PAECh. 13 - Prob. 13.96PAECh. 13 - As the voltaic cell shown here runs, the blue...Ch. 13 - Prob. 13.98PAECh. 13 - For a voltage-sensitive application, you are...Ch. 13 - Prob. 13.100PAECh. 13 - Prob. 13.101PAECh. 13 - Prob. 13.102PAECh. 13 - Prob. 13.103PAECh. 13 - 13.104 (a) What happens when a current is passed...Ch. 13 - A current is passed through a solution of...Ch. 13 - 13.106 Hydrazine, N2H4 , has been proposed as the...Ch. 13 - Prob. 13.107PAE
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