Find the Mass Percentages H_2PO_4

$H_{2} P O_{4}$

Step 1

To find the mass of $1$ mole of $H_{2} P O_{4}$ 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 $H_{2} P O_{4}$ $=$ $2 (mass of H)$ + $(mass of P)$ + $4 (mass of O)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $H_{2} P O_{4}$ $=$ $2 (1.00999999)$ + $(30.96999931)$ + $4 (16)$

Step 3

Simplify the result.

Remove parentheses.

mass of $1$ mole of $H_{2} P O_{4} = 2 (1.00999999) + 30.96999931 + 4 (16) g$

Simplify each term.

Multiply $2$ by $1.00999999$ .

mass of $1$ mole of $H_{2} P O_{4} = 2.01999998 + 30.96999931 + 4 (16) g$

Multiply $4$ by $16$ .

mass of $1$ mole of $H_{2} P O_{4} = 2.01999998 + 30.96999931 + 64 g$

Simplify by adding numbers.

Add $2.01999998$ and $30.96999931$ .

mass of $1$ mole of $H_{2} P O_{4} = 32.98999929 + 64 g$

Add $32.98999929$ and $64$ .

mass of $1$ mole of $H_{2} P O_{4} = 96.98999929 g$

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 $H = \frac{2.02}{96.98999929} \cdot 100$

Divide $2.02$ by $96.98999929$ .

$0.02082688 \cdot 100$

Multiply $0.02082688$ by $100$ .

$2.08268895$

Set the number as a percent.

Mass percentage of $H = 2.08268895 %$

Step 5

Find the mass percentage of $P$ .

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

Mass percentage of $P = \frac{30.97}{96.98999929} \cdot 100$

Divide $30.97$ by $96.98999929$ .

$0.31931127 \cdot 100$

Multiply $0.31931127$ by $100$ .

$31.93112715$

Set the number as a percent.

Mass percentage of $P = 31.93112715 %$

Step 6

Find the mass percentage of $O$ .

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

Mass percentage of $O = \frac{64}{96.98999929} \cdot 100$

Divide $64$ by $96.98999929$ .

$0.65986184 \cdot 100$

Multiply $0.65986184$ by $100$ .

$65.98618462$

Set the number as a percent.

Mass percentage of $O = 65.98618462 %$

Step 7

Find the mass percentage of each element in the molecule.

Mass percentage of $H = 2.08268895 %$

Mass percentage of $P = 31.93112715 %$

Mass percentage of $O = 65.98618462 %$

Find the Mass Percentages H_2PO_4

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