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title: "A recycling laboratory analyzes a \\(1.080\\text{ g}\\) sample of a copper-rich alloy that contains only copper and silver. Chemical analysis indicates that the sample contains \\(2.00\\times10^{-3}\\text{ mol}\\) of \\(\\text{Ag}\\). To confirm the analysis gravimetrically, a student dissolves the sample and adds excess \\(\\text{NaCl(aq)}\\), causing all the \\(\\text{Ag}^+\\text{(aq)}\\) to be recovered as \\(\\text{AgCl(s)}\\), while the copper species remain dissolved. The molar masses of \\(\\text{Ag}\\) and \\(\\text{AgCl}\\) are \\(108.0\\text{ g/mol}\\) and \\(143.5\\text{ g/mol}\\), respectively.  Which pair gives the expected mass of precipitate and the mass percent of copper in the original alloy?"
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url: "https://nerd-notes.com/ubq/119449/"
date_modified: "2026-08-19T12:40:28+00:00"
---

# A recycling laboratory analyzes a \(1.080\text{ g}\) sample of a copper-rich alloy that contains only copper and silver. Chemical analysis indicates that the sample contains \(2.00\times10^{-3}\text{ mol}\) of \(\text{Ag}\). To confirm the analysis gravimetrically, a student dissolves the sample and adds excess \(\text{NaCl(aq)}\), causing all the \(\text{Ag}^+\text{(aq)}\) to be recovered as \(\text{AgCl(s)}\), while the copper species remain dissolved. The molar masses of \(\text{Ag}\) and \(\text{AgCl}\) are \(108.0\text{ g/mol}\) and \(143.5\text{ g/mol}\), respectively.

Which pair gives the expected mass of precipitate and the mass percent of copper in the original alloy?

A recycling laboratory analyzes a \(1.080\text{ g}\) sample of a copper-rich alloy that contains only copper and silver. Chemical analysis indicates that the sample contains \(2.00\times10^{-3}\text{ mol}\) of \(\text{Ag}\). To confirm the analysis gravimetrically, a student dissolves the sample and adds excess \(\text{NaCl(aq)}\), causing all the \(\text{Ag}^+\text{(aq)}\) to be recovered as \(\text{AgCl(s)}\), while the copper species remain dissolved. The molar masses of \(\text{Ag}\) and \(\text{AgCl}\) are \(108.0\text{ g/mol}\) and \(143.5\text{ g/mol}\), respectively.

Which pair gives the expected mass of precipitate and the mass percent of copper in the original alloy?

- **A.** \(0.216\text{ g}\) of \(\text{AgCl}\); \(80.0\%\) \(\text{Cu}\)
- **B.** \(0.287\text{ g}\) of \(\text{AgCl}\); \(80.0\%\) \(\text{Cu}\)
- **C.** \(0.287\text{ g}\) of \(\text{AgCl}\); \(20.0\%\) \(\text{Cu}\)
- **D.** \(0.574\text{ g}\) of \(\text{AgCl}\); \(80.0\%\) \(\text{Cu}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119449/*