Consider a mixture of the two solids CuSO_4 .5H_2O (250 g/mol) and KCl (74.5 g/mol). When the...


Consider a mixture of the two solids {eq}\rm CuSO_4 \cdot 5H_2O\ (250\ g/mol) {/eq} and KCl (74.5 g/mol). When the mixture is heated to {eq}\rm 160^\circ C{/eq} for 1 hour, the water of crystallization is driven off:

{eq}\rm CuSO_4 \cdot 5H_2O (s, blue) \rightarrow CuSO_4 (s, white ) + 5H_2O (g){/eq}

A sample originally weighing 2.000 g weighed 1.500 g after heating. Calculate the weight percent of Cl (35.5 g/mol) in the original sample.

Mole Ratio:

In chemistry, a mole ratio is used to relate the moles of two substances together. The most common mole ratio comes from a balanced chemical equation and is used to relate the moles of different substances in the reaction together (sometimes known as the stoichiometric ratio). However, we can also use chemical formulas to write a mole ratio between the elements that make up a compound and the moles of the compound.

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Mole-to-Mole Ratios and Calculations of a Chemical Equation


Chapter 9 / Lesson 2

Learn about the mole ratio. Understand the definition of mole ratio, how to find mole ratio in stoichiometry, and see examples of using mole ratio in problems.

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