The correct conversion factor for solving the problem “ 1 hour =? Seconds ” has to be identified from the given options, using dimensional analysis and unit pathway. Concept Introduction: Measurement is the measure of quantity, capacity, dimensions or extent of something. Mass, length, pressure, temperature, volume, time and concentration are some common type of measurements. English system and metric system are two types of measurement systems that are in use in the United States. Measurement wise both English system and metric system are precise. There are instance where measurements from one system has to be changed to their equivalent in other system. This is called the conversion factor. These conversion factors always appear as pairs. For example 60min is same as 1hr and vice versa. So two conversion factors are possible for this equality. In case of calculating dimensional analysis, numbers associated with units are used as guide for solving the problems.

Question

Chloroform, long used as an anesthetic and now considered carcinogenic, has a heat of vaporization of 31.4 kJ/mol. During vaporization, its entropy increases by 94.2 J/mol.K. Therefore, select the alternative that indicates the temperature, in degrees Celsius, at which chloroform begins to boil under a pressure of 1 atm. A) 28 B) 40 C) 52 D) 60 E) 72

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Question

Chapter 2.8, Problem 2QQ

Interpretation Introduction

Interpretation:

The correct conversion factor for solving the problem “1 hour =? Seconds ” has to be identified from the given options, using dimensional analysis and unit pathway.

Concept Introduction:

Measurement is the measure of quantity, capacity, dimensions or extent of something. Mass, length, pressure, temperature, volume, time and concentration are some common type of measurements. English system and metric system are two types of measurement systems that are in use in the United States. Measurement wise both English system and metric system are precise. There are instance where measurements from one system has to be changed to their equivalent in other system. This is called the conversion factor. These conversion factors always appear as pairs. For example 60min is same as 1hr and vice versa. So two conversion factors are possible for this equality. In case of calculating dimensional analysis, numbers associated with units are used as guide for solving the problems.

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Chloroform, long used as an anesthetic and now considered carcinogenic, has a heat of vaporization of 31.4 kJ/mol. During vaporization, its entropy increases by 94.2 J/mol.K. Therefore, select the alternative that indicates the temperature, in degrees Celsius, at which chloroform begins to boil under a pressure of 1 atm. A) 28 B) 40 C) 52 D) 60 E) 72

If we assume a system with an anodic overpotential, the variation of n as a function of current density: 1. at low fields is linear 2. at higher fields, it follows Tafel's law Obtain the range of current densities for which the overpotential has the same value when calculated for 1 and 2 cases (maximum relative difference of 5% compared to the behavior for higher fields). To which overpotential range does this correspond? Data: i = 1.5 mA cm², T = 300°C, B = 0.64, R = 8.314 J K1 mol-1 and F = 96485 C mol-1.

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