A specific steroid has a λmax of 282 nm and a molar absorptivity ε of 11 , 500 L mol − 1 cm − 1 . What is the concentration of the compound in a solution whose absorbance at 282 nm is A = 0.060 with a sample pathlength of 1.00 cm ?

The molar concentration of the compound is 5.2 x 10⁻⁶ M

Explanation:

According to Beer-Lambert law the concentration of the sample and the sample path length have a linear relationship with the light absorbed at a particular wavelength.  

This problem can be solved by this equation, which is as follows,

A =  ε.b.C

Here,  A is the absorbance, ε is the molar absorptivity, b is the sample path length and C is the molar concentration

0.060 = 11500 x (1) x C

C = 5.2 x 10⁻⁶ M

-be a crystalline solid

- be soluble in water

-conduct electricity

hope this : )

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.