Percent Composition

Front

What is percent composition?

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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 in a compound, 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 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)?

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

Front

If a compound has a molar mass of 100 g/mol and contains 20 g of element X, what is the percent composition of element X?

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The percent composition of element X is (20 g / 100 g) x 100 = 20%.

Front

What is the percent composition of lithium in lithium phosphide (Li3P)?

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The percent composition of lithium in lithium phosphide (Li3P) is 40%.

Front

What is the percent composition of oxygen in carbon monoxide (CO)?

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The percent composition of oxygen in carbon monoxide (CO) is 57%.

Front

What is the percent composition of bromine in magnesium bromide (MgBr2)?

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The percent composition of bromine in magnesium bromide (MgBr2) is 87%.

Front

What is the percent composition of carbon in carbon monoxide (CO)?

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The percent composition of carbon in carbon monoxide (CO) is 43%.