Percent Compostion

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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.

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

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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 percent composition of carbon in carbon monoxide (CO)?

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43%.

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What is the percent composition of sulfur in magnesium sulfate (MgSO4)?

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27%.

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What is the percent composition of hydroxide (OH-) in calcium hydroxide (Ca(OH)2)?

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45.9%.

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

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87%.

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What is the percent composition of magnesium in magnesium phosphate (Mg3(PO4)2)?

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27.48%.

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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20%.

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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.

Front

What is the percent composition of oxygen in water (H2O)?

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88.8%.