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 / total mass of compound) x 100.

Front

What is the percent composition of Iron (Fe) and Sulfur (S) in a compound formed from 2.79 g of Fe and 1.60 g of S?

Back

64% Fe and 36% S.

Front

What is the percent composition of Carbon (C) and Hydrogen (H) in a compound containing 14.41 g of C and 3.23 g of H?

Back

82% C and 18% H.

Front

What is the percent composition of Nitrogen (N) in calcium nitrate?

Back

17.1%.

Front

What is the percent composition of Magnesium (Mg) in magnesium chloride?

Back

25.5%.

Front

What is the percent composition of each element in C2H5NO?

Back

41% C, 9% H, 24% N, 27% O.

Front

What is the total mass of a compound if it contains 10 g of element A and 5 g of element B?

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Total mass = 10 g + 5 g = 15 g.

Front

If a compound has a total mass of 50 g and contains 10 g of element X, what is the percent composition of element X?

Back

(10 g / 50 g) x 100 = 20%.

Front

What is the significance of percent composition in chemistry?

Back

Percent composition helps in understanding the composition of compounds, stoichiometry in reactions, and determining empirical formulas.