Moles How many moles of sodium ions, [latex]\text{Na}^{+}[/latex], are in 5.63 g of sodium sulfate, [latex]\text{Na}_{2}\text{SO}_{4}[/latex]? Strategy The formula weight of [latex]\text{Na}_{2}\text{SO}_{4}[/latex] is 2(23.0) + 32.1 + 4(16.0) = 142.1 amu. In the conversion of grams [latex]\text{Na}_{2}\text{SO}_{4}[/latex] to moles, we use the conversion factors 1 mol [latex]\text{Na}_{2}\text{SO}_{4}[/latex] = 142.1 g [latex]\text{Na}_{2}\text{SO}_{4}[/latex] and 1 mole [latex]\text{Na}_{2}\text{SO}_{4}[/latex] = 2 moles [latex]\text{Na}^{+}[/latex].

First, we need to find out how many moles of [latex]\text{Na}_{2}\text{SO}_{4}[/latex] are in the sample. [latex]5.63\ \cancel{\text{g}\ \text{Na}_{2}\text{SO}_{4}}\times \frac{1\ \text{mol}\ \text{Na}_{2}\text{SO}_{4}}{142.1\ \cancel{\text{g}\ \text{Na}_{2}\text{SO}_{4}}}= 0.0396 \ \text{mol}\ \text{Na}_{2}\text{SO}_{4}[/latex] The number of moles of [latex]\text{Na}^{+}[/latex] ions in 0.0396 mol of [latex]\text{Na}_{2}\text{SO}_{4}[/latex] is: [latex]0.0396\ \cancel{\text{mol}\ \text{Na}_{2}\text{SO}_{4}}\times \frac{2\ \text{mol}\ \text{Na}^{+}}{1\ \cancel{\text{mol}\ \text{Na}_{2}\text{SO}_{4}}}= 0.0792 \ \text{mol}\ \text{Na}^{+}[/latex] ■ Quick Check 4.10 How many moles of copper(I) ions, [latex]\text{Cu}^{+}[/latex], are there in 0.062 g of copper(I) nitrate, [latex]\text{CuNO}_{3}[/latex]?

Question 4.10: Moles How many moles of sodium ions, Na^+, are in 5.63 g of ...

Introduction to General, Organic, and Biochemistry

Moles
How many moles of sodium ions, $\text{Na}^{+}$ , are in 5.63 g of sodium sulfate, $\text{Na}_{2}\text{SO}_{4}$ ?

Strategy
The formula weight of $\text{Na}_{2}\text{SO}_{4}$ is 2(23.0) + 32.1 + 4(16.0) = 142.1 amu. In the conversion of grams $\text{Na}_{2}\text{SO}_{4}$ to moles, we use the conversion factors 1 mol $\text{Na}_{2}\text{SO}_{4}$ = 142.1 g $\text{Na}_{2}\text{SO}_{4}$ and 1 mole $\text{Na}_{2}\text{SO}_{4}$ = 2 moles $\text{Na}^{+}$ .

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First, we need to find out how many moles of $\text{Na}_{2}\text{SO}_{4}$ are in the sample.