The molar absorptivity of a solution containing A and having transmittance of 64.1 % is to be calculated. Concept introduction: The molar absorptivity of a solution is defined as the capacity of a solution to absorb the particular wavelength of light incident on it. In order to calculate the molar absorptivity, first the absorbance of the solution is determined using the Beer’s law. A = − log T Now, the relation between the molar absorptivity, absorbance and concentration of the solution is given by the relation. A = ε b c

Question

When 15.00 mL of 3.00 M NaOH was mixed in a calorimeter with 12.80 mL of 3.00 M HCl, both initially at room temperature (22.00 C), the temperature increased to 29.30 C. The resultant salt solution had a mass of 27.80 g and a specific heat capacity of 3.74 J/Kg. What is heat capacity of the calorimeter (in J/C)? Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ/mol. Which experimental number must be initialled by the Lab TA for the first run of Part 1 of the experiment? a) the heat capacity of the calorimeter b) Mass of sample c) Ti d) The molarity of the HCl e) Tf

Answer 1

Question

Chapter 13, Problem 13.6QAP

Interpretation Introduction

Interpretation:

The molar absorptivity of a solution containing A and having transmittance of 64.1% is to be calculated.

Concept introduction:

The molar absorptivity of a solution is defined as the capacity of a solution to absorb the particular wavelength of light incident on it. In order to calculate the molar absorptivity, first the absorbance of the solution is determined using the Beer’s law.

A=−logT

Now, the relation between the molar absorptivity, absorbance and concentration of the solution is given by the relation.

A=εbc

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