Percent Composition Flashcard

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

Front

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

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To find the percent composition of magnesium in MgBr2, calculate: (mass of Mg / total mass of MgBr2) x 100.

Front

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

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The molar mass of MgBr2 is approximately 184.11 g/mol (24.31 g/mol for Mg and 79.90 g/mol for each Br, with 2 Br atoms).

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Which element has a higher percent composition in magnesium bromide, magnesium or bromine?

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Bromine has a higher percent composition in magnesium bromide (MgBr2) because it contributes more to the total mass.

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What is the percent composition of oxygen in aluminum phosphate (AlPO4)?

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The percent composition of oxygen in AlPO4 is approximately 42.1%.

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In carbon monoxide (CO), which element has a higher percent composition?

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Oxygen has a higher percent composition in carbon monoxide (CO) than carbon.

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What is the percent composition of potassium in potassium cyanide (KCN)?

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The percent composition of potassium in KCN is approximately 60.97%.

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How do you determine which element contributes more to the mass of a compound?

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Compare the percent compositions of the elements in the compound; the one with the higher percent composition contributes more to the mass.

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What is the significance of knowing the percent composition of a compound?

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Knowing the percent composition helps in understanding the chemical properties and reactivity of the compound.