A solution of 4-methyl-3-penten-2-one in ethanol shows an absorbance of 0.52 at 236 nm in a cell with a 1-cm light path. Its molar absorptivity in ethanol at that wavelength is 12,600 M^-1 cm^-1. What is the concentration of the compound?

A = ebc

A = 0.52
e = 12,600
b = 1 cm
Solve for c = concentration in mols/L.

To find the concentration of the compound, we can use the Beer-Lambert Law, which relates the absorbance of a solution to the concentration and molar absorptivity of the compound.

The Beer-Lambert Law equation is:
A = ε * c * l

Where:
A is the absorbance,
ε is the molar absorptivity (in units of M^-1 cm^-1),
c is the concentration (in units of M),
l is the path length (in units of cm).

Given values:
Absorbance (A) = 0.52
Molar absorptivity (ε) = 12,600 M^-1 cm^-1
Path length (l) = 1 cm

Substituting the given values into the equation, we get:
0.52 = 12,600 * c * 1

Simplifying the equation:
0.52 = 12,600 * c

Now, we can solve for the concentration (c):
c = 0.52 / 12,600

Calculating the concentration:
c = 0.00004127 M

Therefore, the concentration of the compound in the solution is approximately 0.00004127 M.