Student measured the absorbance of substance x in aqueous solution depending on concentration. he used 0.5 cm cuvette for his measurements; concentration was expressed in moles/l and plotted on x-axis, while absorbance was on y-axis. his data were best fitted by the straight line with equation y = 2120x + 0.0112. the extinction coefficient for substance x in aqueous solution is:

The extinction coefficient is 4240 M⁻¹cm⁻¹

Explanation:

The Beer-Lambert law for the absorbance of a monochromatic light by a molecule is given by the following mathematical expression:

----------------------(1)

Here, E is the extinction coefficient, b is the length of light pathway through the solution and C is the concentration in mol/L. This is a linear equation and fits well with its formula  

y = mx + C-------------------(2)

Here, m is the slope and C is the y intercept. y and x are the two variables. Comparing  equation 1 and 2, Absorbance (A) and molar concentration (C) are the two variables, while the product of extinction coefficient (E) and path length (b) makes the slope of the line. The y-intercept in the given equation is due to the solvent interference.

From this information, we can determine the extinction coefficient by the slope of the line with the following formula.

most likely he is cheating on you

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.