Find the Mass Percentages HCl

$H C l$

Step 1

To find the mass of $1$ mole of $H C l$ 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 $H C l$ $=$ $(mass of H)$ + $(mass of Cl)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $H C l$ $=$ $(1.00999999)$ + $(35.45000076)$

Step 3

Simplify the result.

Remove parentheses.

mass of $1$ mole of $H C l = 1.00999999 + 35.45000076 g$

Add $1.00999999$ and $35.45000076$ .

mass of $1$ mole of $H C l = 36.46000075 g$

Step 4

Find the mass percentage of $H$ .

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

Mass percentage of $H = \frac{1.01}{36.46000075} \cdot 100$

Divide $1.01$ by $36.46000075$ .

$0.02770159 \cdot 100$

Multiply $0.02770159$ by $100$ .

$2.77015902$

Set the number as a percent.

Mass percentage of $H = 2.77015902 %$

Step 5

Find the mass percentage of $C l$ .

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

Mass percentage of $C l = \frac{35.45}{36.46000075} \cdot 100$

Divide $35.45$ by $36.46000075$ .

$0.97229838 \cdot 100$

Multiply $0.97229838$ by $100$ .

$97.22983891$

Set the number as a percent.

Mass percentage of $C l = 97.22983891 %$

Step 6

Find the mass percentage of each element in the molecule.

Mass percentage of $H = 2.77015902 %$

Mass percentage of $C l = 97.22983891 %$

Find the Mass Percentages HCl

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