A least-squares analysis of absorbance data for a dye yields the equation A = 42.0 ,c…

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A least-squares analysis of absorbance data for a dye yields the equation

A = 42.0\,c + 0.022,

where

A

is absorbance (unitless) and

c

is concentration in mol L

^{-1}

. A sample of the dye shows an absorbance of 0.433 in a 1.00 cm cuvette at the same wavelength. What is the concentration of the sample? (a)

4.2 \times 10^{-2}\,\text{mol L}^{-1}

(b)

9.8 \times 10^{-3}\,\text{mol L}^{-1}

(c)

1.0 \times 10^{-2}\,\text{mol L}^{-1}

(d)

1.1 \times 10^{-2}\,\text{mol L}^{-1}