Percent Composition Flashcard

Front

What is percent composition?

Back

Percent composition is the percentage by mass of each element in a compound, calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100.

Front

How do you calculate the percent composition of an element in a compound?

Back

To calculate percent composition, use the formula: (mass of element in 1 mole of compound / molar mass of compound) x 100.

Front

What is the molar mass of CaF2?

Back

The molar mass of CaF2 (Calcium Fluoride) is 78 g/mol.

Front

What is the percent by mass of fluorine in CaF2?

Back

49%.

Front

Which element in KCN has a percent composition of 60.97%?

Back

Potassium (K).

Front

What is the chemical formula for magnesium bromide?

Back

MgBr2.

Front

In MgBr2, which element contributes more to the total mass?

Back

Bromine.

Front

What is the total atomic mass of lithium phosphide (Li3P)?

Back

The total atomic mass is calculated by adding the atomic masses of 3 lithium atoms and 1 phosphorus atom.

Front

What percentage of the total atomic mass of Li3P is composed of lithium?

Back

40%.

Front

What percentage of the total atomic mass of Li3P is composed of phosphorus?

Back

60%.