Chemistry Examples

$S i$

Step 1

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

$28.09$

Step 2

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

$\frac{28.09}{6.022 \cdot 10^{23}}$

Step 3

Divide using scientific notation.

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Step 3.1

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

$(\frac{28.09}{6.022}) (\frac{1}{10^{23}})$

Step 3.2

Divide $28.09$ by $6.022$ .

$4.66456326 \frac{1}{10^{23}}$

Step 3.3

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

$4.66456326 \cdot 10^{- 23}$

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