Percent Composition

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What is the percent by mass of oxygen in MgO?

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40%

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What is the percent by mass of magnesium in MgO? Options: 20%, 40%, 50%, 60%

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60%

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What is the percent by mass of fluorine in CaF₂ (gram-formula mass = 78 g/mol)? Options: 24%, 49%, 51%, 65%

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49%

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Percent composition by mass of sulfur in MgSO₄ (gram formula mass = 120 g/mol)? Options: 20%, 27%, 46%, 53%

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27%

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What is the percent composition by mass of oxygen in the compound MgSO₄ (gram formula mass = 120 g/mol)? Options: 20%, 27%, 46%, 53%

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53%

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In which compound is the percent composition by mass of Cl equal to 42%? Options: HClO (gram formula mass = 52 g/mol), HClO₂ (gram formula mass = 68 g/mol), HClO₃ (gram formula mass = 84 g/mol), HClO₄ (gram formula mass = 100 g/mol)

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HClO₃ (gram formula mass = 84 g/mol)

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Find the percent composition of Cu₂S?

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%Cu= 79.854   %S= 20.145

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What is the percent composition of Benzene, C₆H₆? Options: C = 50%
H = 50%, C = 85.7 %
H = 14.3%, C = 92.2%
H = 7.8%, C = 71.9%
H = 28.1%

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C = 92.2%
H = 7.8%

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Empirical formula for Pb₅Cr₅O₂₀

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PbCrO₄

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Element with 39.03% abundance in Na₃PO₄

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O