AP Chemistry
1.4 Composition of Mixtures
1.3 Elemental Composition of Pure Substances
1.1 Moles and Molar Mass
A manufacturer lists magnesium oxide, \(\text{MgO}\), as \(40.0\%\) of the mass of a tablet. Any remaining material consists of inert excipients that contain no magnesium. A student obtains the following elemental-analysis results.
Which statement best reconciles the elemental-analysis result with the listed mass percent and accounts for the remaining tablet mass?
| Quantity | Value |
|---|---|
| Mass of tablet sample | \(2.000\text{ g}\) |
| Mass of \(\text{Mg}\) in sample | \(0.480\text{ g}\) |
| Molar mass of \(\text{Mg}\) | \(24.3\text{ g/mol}\) |
| Molar mass of \(\text{MgO}\) | \(40.3\text{ g/mol}\) |
Which statement best reconciles the elemental-analysis result with the listed mass percent and accounts for the remaining tablet mass?
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