Find the Mass Percentages Br

$B r$

Step 1

To find the mass of $1$ mole of $B r$ look up the atomic mass of each element and multiply it by the number of atoms contained in each element in the molecule.

mass of $1$ mole of $B r$ $=$ $(mass of Br)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $B r$ $=$ $(79.90000152)$

Step 3

Remove parentheses.

mass of $1$ mole of $B r = 79.90000152 g$

Step 4

Find the mass percentage of $B r$ .

The mass composition percentage is the mass of $B r$ divided by the mass of the entire molecule converted to a percentage.

Mass percentage of $B r = \frac{79.9}{79.90000152} \cdot 100$

Divide $79.9$ by $79.90000152$ .

$0.99999998 \cdot 100$

Multiply $0.99999998$ by $100$ .

$99.99999809$

Set the number as a percent.

Mass percentage of $B r = 99.99999809 %$

Find the Mass Percentages Br

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