Question

The molar absorptivity of Beta-carotene at 490 nm is 1.36 x 105 M-1cm-1. What is the concentration of a solution of Beta-carotene that has an absorbance, A490 = 140 in a cell with a path length of 1 cm? The molar absorptivity of Beta-carotene at 490 nm is 1.36 x 105 M-1cm-1. What is the concentration of a solution of Beta-carotene that has an absorbance, A490 = 140 in a cell with a path length of 1 cm? 2.5 x 10-4 M 5.0 x 10-4 M 1.3 x 10-4 M 2.0 x 10-3 M 1.0 x 10-3 M?

Answer 1

The correct answer to the following question will be Option E (1.0 x 10⁻³ M).

Step-by-step explanation:

The given values are:

`A\lambda =140`

`\varepsilon=1.36* 10^5 \ M \ {cm^(-1)}`

L = 1 \ cm

As we know,

⇒
`A\lambda=\varepsilon CL`

On putting the given values in the above formula, we get

⇒
`140=1.36* 10^5* C* 1`

⇒
`C=(140)/(1.36* 10^5)`

⇒
`C=102.9* 10^(-5) \ M`

So that option E is the right answer.