---
title: "A student determines the composition of a mixture containing only \\(\\text{NaCl(s)}\\) and sand. The student adds excess distilled water so that all the \\(\\text{NaCl(s)}\\) dissolves, filters the mixture, and dries the filter paper and residue to constant mass. Because the sand is insoluble, the dry residue is sand.  | Measurement | Mass | |————-|——| | Original mixture | \\(12.0\\text{ g}\\) | | Dry filter paper | \\(1.00\\text{ g}\\) | | Dry filter paper and residue | \\(4.00\\text{ g}\\) |  What is the mass percent of sand in the original mixture?"
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url: "https://nerd-notes.com/ubq/119365/"
date_modified: "2026-08-19T12:40:00+00:00"
---

# A student determines the composition of a mixture containing only \(\text{NaCl(s)}\) and sand. The student adds excess distilled water so that all the \(\text{NaCl(s)}\) dissolves, filters the mixture, and dries the filter paper and residue to constant mass. Because the sand is insoluble, the dry residue is sand.

| Measurement | Mass |
|————-|——|
| Original mixture | \(12.0\text{ g}\) |
| Dry filter paper | \(1.00\text{ g}\) |
| Dry filter paper and residue | \(4.00\text{ g}\) |

What is the mass percent of sand in the original mixture?

A student determines the composition of a mixture containing only \(\text{NaCl(s)}\) and sand. The student adds excess distilled water so that all the \(\text{NaCl(s)}\) dissolves, filters the mixture, and dries the filter paper and residue to constant mass. Because the sand is insoluble, the dry residue is sand.

| Measurement | Mass |
|-------------|------|
| Original mixture | \(12.0\text{ g}\) |
| Dry filter paper | \(1.00\text{ g}\) |
| Dry filter paper and residue | \(4.00\text{ g}\) |

What is the mass percent of sand in the original mixture?

- **A.** \(8.33\%\)
- **B.** \(16.7\%\)
- **C.** \(23.1\%\)
- **D.** \(25.0\%\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119365/*