Chemistry Examples

$P$

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

$30.97$

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

$\frac{30.97}{6.022 \cdot 10^{23}}$

Divide using scientific notation.

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

$(\frac{30.97}{6.022}) \cdot (\frac{1}{10^{23}})$

Divide $30.97$ by $6.022$ .

$5.14280969 \frac{1}{10^{23}}$

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

$5.14280969 \cdot 10^{- 23}$

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