The molar absorptivity of a compound at 500 nm wavelength is 252 M-1cm-1. Suppose one prepares a solution by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution. What would be the absorbance in a 3 .00 mm pathlength cell?

The absorbance of the solution is 0.21168.

Explanation:

Given that,

Wavelength = 500 nm

Molar absorptivity = 252 M⁻¹ cm⁻¹

Number of moles = 0.00140

Volume of solution = 500.0 mL

Length = 3.00 mm

We need to calculate the molar concentration

Using formula of the molar concentration

Where, N = number of moles

V = volume

Put the value into the formula

We need to calculate the absorbance of the solution

Using formula of absorbance

Put the value into the formula

Hence, The absorbance of the solution is 0.21168.

Because all the compounds are at the same concentration, the one that can produce more particles in solution will be the one that will raise the boiling point the most.

A. 2.0 M (NH4)3PO4  will produce 4 particles per molecule formula