Question

If a sample of an new element has a mass of 569.3 g, how many moles of the element does the sample contain, given MW = 79.32 g/mol?

Answer 1

Step 1

The number of moles is calculated as:

$Moles\text{ = }\frac{Mass}{Molar\text{ mass}}$

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Step 2

Information provided:

Mass = 569.3 g

Molar mass or molar weight = 79.32 g/mol

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Step 3

$\begin{gathered} Moles\text{ = }\frac{569.3\text{ g}}{79.32\text{ }\frac{g}{mol}} \\ Moles\text{ = 7.177 moles} \end{gathered}$

Answer: Moles = 7.177 moles