Find the Mass Percentages KrAmRa

$K r A m R a$

Step 1

To find the mass of $1$ mole of $K r A m R a$ 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 $K r A m R a$ $=$ $(mass of Kr)$ + $(mass of Am)$ + $(mass of Ra)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $K r A m R a$ $=$ $(83.80000305)$ + $(243)$ + $(226)$

Step 3

Simplify the result.

Remove parentheses.

mass of $1$ mole of $K r A m R a = 83.80000305 + 243 + 226 g$

Add $83.80000305$ and $243$ .

mass of $1$ mole of $K r A m R a = 326.80000305 + 226 g$

Add $326.80000305$ and $226$ .

mass of $1$ mole of $K r A m R a = 552.80000305 g$

Step 4

Find the mass percentage of $K r$ .

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

Mass percentage of $K r = \frac{83.8}{552.80000305} \cdot 100$

Divide $83.8$ by $552.80000305$ .

$0.15159189 \cdot 100$

Multiply $0.15159189$ by $100$ .

$15.15918949$

Set the number as a percent.

Mass percentage of $K r = 15.15918949 %$

Step 5

Find the mass percentage of $A m$ .

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

Mass percentage of $A m = \frac{243}{552.80000305} \cdot 100$

Divide $243$ by $552.80000305$ .

$0.43958031 \cdot 100$

Multiply $0.43958031$ by $100$ .

$43.95803159$

Set the number as a percent.

Mass percentage of $A m = 43.95803159 %$

Step 6

Find the mass percentage of $R a$ .

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

Mass percentage of $R a = \frac{226}{552.80000305} \cdot 100$

Divide $226$ by $552.80000305$ .

$0.40882778 \cdot 100$

Multiply $0.40882778$ by $100$ .

$40.88277835$

Set the number as a percent.

Mass percentage of $R a = 40.88277835 %$

Step 7

Find the mass percentage of each element in the molecule.

Mass percentage of $K r = 15.15918949 %$

Mass percentage of $A m = 43.95803159 %$

Mass percentage of $R a = 40.88277835 %$

Find the Mass Percentages KrAmRa

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