Percent Composition

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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?

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

Front

What is the molar mass of lithium phosphide (Li3P)?

Back

The molar mass of lithium phosphide (Li3P) is approximately 34.83 g/mol.

Front

What is the molar mass of calcium nitrate (Ca(NO3)2)?

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The molar mass of calcium nitrate (Ca(NO3)2) is approximately 164.10 g/mol.

Front

What is the molar mass of carbon monoxide (CO)?

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The molar mass of carbon monoxide (CO) is approximately 28.01 g/mol.

Front

What is the molar mass of magnesium bromide (MgBr2)?

Back

The molar mass of magnesium bromide (MgBr2) is approximately 184.11 g/mol.

Front

If a compound contains 3 lithium atoms and 1 phosphorus atom, how do you find the percent composition of lithium?

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Calculate the total mass of lithium (3 x 6.94 g/mol) and divide by the total mass of Li3P (34.83 g/mol), then multiply by 100.

Front

What is the percent composition of nitrogen in calcium nitrate (Ca(NO3)2)?

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The percent composition of nitrogen in calcium nitrate is approximately 17%.

Front

In magnesium bromide (MgBr2), which element has a higher percent composition?

Back

Bromine has a higher percent composition than magnesium.

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What is the significance of percent composition in chemistry?

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