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Chapter 3: Problem 42

How many moles are represented by each of the following. \begin{equation} \begin{array}{l}{\text { a. } 11.5 \mathrm{g} \text { Na which has an atomic mass of }} \\ {22.99 \text { amu }} \\ {\text { b. } 150 \mathrm{g} \text { S which has an atomic mass of }} \\ {32.07 \text { amu }}\end{array} \end{equation} \begin{equation} \begin{array}{l}{\text { c. } 5.87 \text { g Ni which has an atomic mass of }} \\\ {58.69 \text { amu }}\end{array} \end{equation}

Short Answer

Expert verified
a. 0.50 moles of Na, b. 4.68 moles of S, c. 0.10 moles of Ni

Step by step solution

01

Convert grams to moles for Na

The principle for converting grams to moles is applying the formula: Number of moles = mass in grams / molar mass of the element. For Na (Sodium), the molar mass is 22.99 g/mol. So, the calculation becomes: Number of moles = 11.5 g / 22.99 g/mol = 0.50 moles.
02

Convert grams to moles for S

Using the same principle for S (Sulphur), the molar mass is 32.07 g/mol. So, the calculation becomes: Number of moles = 150 g / 32.07 g/mol = 4.68 moles.
03

Convert grams to moles for Ni

Finally, for Ni (Nickel), the molar mass is 58.69 g/mol. So, the calculation becomes: Number of moles = 5.87 g / 58.69 g/mol = 0.10 moles.

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