Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 2, Problem 2.11QAP
Interpretation Introduction
Interpretation:
Using the equation related to Ohm’s law, current at the beginning & completion of the
Concept introduction:
The equation for Ohm’s law is given below.
Here, V is voltage, I is current, and R is resistance.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The exchange-current density for a Pt|Fe3+,Fe2+ electrode is 2.5 mA cm−2. The standard potential of the electrode is +0.77 V. Derive an expression for the current flowing through an electrode of surface area 1.0 cm2 as a function of the potential applied to the electrode; assume standard conditions.
Which unit is used to measure the magnitude of electricalcurrent? Which unit is used to measure the magnitude of apotential difference? Explain how electrical current and potentialdifference differ.
The exchange current density at the electrode Pt| Fe3+| Fe2+ is 2.4 x 10-3 A cm-2, How many electrons are transported through the double layer per second in the cell (area of 1 cm2 each)? Estimate the number of times per second that a single atom on the surface takes part in an electron transfer event, assuming that the atom occupies 280 pm2 of the surface of the electrode
Chapter 2 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Similar questions
- A fuel cell develops an electric potential from the chemical reaction between reagents supplied from an outside source. What is the potential of a cell fuelled by (a) hydrogen and oxygen, (b) the complete oxidation of benzene at 10 bar and 298 K?arrow_forwardA block of copper of mass 500 g and initially at 293 K is in thermal contact with an electric heater of resistance 1.00 kΩ and negligible mass. A current of 1.00 A is passed for 15.0 s. Calculate the change in entropy of the copper, taking Cp,m = 24.4 J K−1 mol−1. The experiment is then repeated with the copper immersed in a stream of water that maintains the temperature of the copper block at 293 K. Calculate the change in entropy of the copper and the water in this case.arrow_forward. A sample of a liquid which has molar mass 102 g/mol was heated in a vessel by using electricity. Theliquid boiled at 78°C when the pressure was 650 Torr. At the boiling point, it was found that 1.871 gof the sample vaporized when a current of 0.232 A from a 12.0 V supply was passed for 650 s.Calculate the (molar) enthalpy and internal energy of vaporization.arrow_forward
- Calculate the required voltage (V) if an unknown metal (M) was electrodeposited from an aqueous solution containing M2X1 (where X is the anion) with a supplied current of 4.98 A for 11 h, consuming 0.1145 kWh of electrical energy. Assume that the current efficiency is 93%. (Input values only with 2 decimal places. Do not include the unit.)arrow_forwardThe relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by ____?arrow_forwardFor the reaction Zn(s) + Cu2+(aq) - 5 Zn2+(aq) + Cu(s), ∆G° at 25°C is -212,300 Jmol-1. Calculate the electromotive force E in volts for the cell Zn(s) | Zn2+(aq,a1) | | Cu2+ (aq,a2) | Cu(s) when the activities a1 and a2 are 0.01450 and 0.0880, respectively.arrow_forward
- During an electrolysis process a current of 3.20 amperes was used for a period of 2 hours and 49 minutes. How many moles of e- flowed through the electrolysis cell?arrow_forwardA 1.00 mol sample of water vapour is enclosed in a rigid container equipped with a 9.97 Ω electric resistance heater. When a current of 0.200 A is passed through the resistor for 100.0 s, the temperature of the apparatus was observed to increase by 0.465 K. Separate measurements on the evacuated container show that the heat capacity of the container and resistance heater is 60.50 J. K-1. Calculate the value of Cv for the gaseous water (water vapour)arrow_forwardCalculate the required voltage (V) if an unknown metal (M) was electrodeposited from an aqueous solution containing M2X1 (where X is the anion) with a supplied current of 4.98 A for 11 h, consuming 0.1145 kWh of electrical energy. Assume that the current efficiency is 93%. (Input values only with 2 decimal placesarrow_forward
- Consider the reaction at 25°C (Masterton et al., 2012)t%<=(}) + 4 5({¡)7 + 2 é&({¡) ê → t%({¡)=7 + é&=(8) + 25=<(8)At what pH is the voltage zero if all other species are at standard conditions?arrow_forwardCalculate the maximum non-expansion work per mole of C3H8 that may be obtained from a fuel cell in which the chemical reaction is the combustion of propane under standard conditions at 298 K.arrow_forwardHow many electrons or protons are transported through the double layer per second for each of the electrodes Cu,H2|H+ and Pt|Ce4+,Ce3+ when they are at equilibrium at 25 °C? Take the area as 1.0 cm2 in each case. Estimate the number of times each second a single atom on the surface takes part in an electron transfer event, assuming an electrode atom occupies about (260 pm)2 of the surface.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning