Chemistry Examples

$C l$

To calculate the mass of a single atom, first look up the atomic mass of $C l$ from the periodic table. This is also the mass in grams of 1 mole of $C l$ .

$35.45$

Use Avogadro's number to find the mass of a single atom.

$\frac{35.45}{6.022 \cdot 10^{23}}$

Divide using scientific notation.

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Group coefficients together and exponents together to divide numbers in scientific notation.

$(\frac{35.45}{6.022}) (\frac{1}{10^{23}})$

Divide $35.45$ by $6.022$ .

$5.88674858 \frac{1}{10^{23}}$

Move $10^{23}$ to the numerator using the negative exponent rule $\frac{1}{b^{n}} = b^{- n}$ .

$5.88674858 \cdot 10^{- 23}$

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