Unit 1.4: Composition of Mixtures
Compare and contrast pure substances and mixtures.
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Classify the following as a pure substance or mixture: (a) salt water
(b) gold (c) air.
Perform calculations to determine the formula and/or purity of a
compound by calculating/comparing relative amounts.
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A mixture of magnesium oxide (MgO) and sodium oxide (Na2O)
contains the 25.0% Mg, 43.4% Na and 31.6% O. What percent by mass of the
mixture is MgO?
