Chemistry Examples

$B a$

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

$137.33$

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

$\frac{137.33}{6.022 \cdot 10^{23}}$

Simplify the expression.

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Divide using scientific notation.

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

$(\frac{137.33}{6.022}) (\frac{1}{10^{23}})$

Divide $137.33$ by $6.022$ .

$22.80471604 \frac{1}{10^{23}}$

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

$22.80471604 \cdot 10^{- 23}$

Write $22.80471604 \cdot 10^{- 23}$ in proper scientific notation.

$2.2804716 \cdot 10^{- 22}$

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