---
title: "A student measures the absorbance of a solution of \\(\\text{Co(NO}_3\\text{)}_2\\text{(aq)}\\) using a spectrophotometer set to the wavelength of maximum absorbance, \\(\\lambda_{\\text{max}} = 510 \\, \\text{nm}\\). The sample has a concentration of \\(2.50 \\times 10^{-3} \\, \\text{M}\\) and is placed in a sample cuvette with a path length of \\(0.500 \\, \\text{cm}\\). The measured absorbance is \\(0.600\\). Based on these data, what is the molar absorptivity, \\(\\epsilon\\), of \\(\\text{Co(NO}_3\\text{)}_2\\text{(aq)}\\) at \\(510 \\, \\text{nm}\\)?"
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url: "https://nerd-notes.com/ubq/119999/"
date_modified: "2026-08-21T14:56:05+00:00"
---

# A student measures the absorbance of a solution of \(\text{Co(NO}_3\text{)}_2\text{(aq)}\) using a spectrophotometer set to the wavelength of maximum absorbance, \(\lambda_{\text{max}} = 510 \, \text{nm}\). The sample has a concentration of \(2.50 \times 10^{-3} \, \text{M}\) and is placed in a sample cuvette with a path length of \(0.500 \, \text{cm}\). The measured absorbance is \(0.600\). Based on these data, what is the molar absorptivity, \(\epsilon\), of \(\text{Co(NO}_3\text{)}_2\text{(aq)}\) at \(510 \, \text{nm}\)?

A student measures the absorbance of a solution of \(\text{Co(NO}_3\text{)}_2\text{(aq)}\) using a spectrophotometer set to the wavelength of maximum absorbance, \(\lambda_{\text{max}} = 510 \, \text{nm}\). The sample has a concentration of \(2.50 \times 10^{-3} \, \text{M}\) and is placed in a sample cuvette with a path length of \(0.500 \, \text{cm}\). The measured absorbance is \(0.600\). Based on these data, what is the molar absorptivity, \(\epsilon\), of \(\text{Co(NO}_3\text{)}_2\text{(aq)}\) at \(510 \, \text{nm}\)?

- **A.** \(4.80 \times 10^1\text{ M}^{-1}\text{ cm}^{-1}\)
- **B.** \(1.20 \times 10^2\text{ M}^{-1}\text{ cm}^{-1}\)
- **C.** \(2.40 \times 10^2\text{ M}^{-1}\text{ cm}^{-1}\)
- **D.** \(4.80 \times 10^2\text{ M}^{-1}\text{ cm}^{-1}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119999/*