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What is the percent of phosphorus by mass in phosphoric acid, H3PO4? Use 1.008 g/mol for the molar mass of hydrogen, 16.00 g/mol for the molar mass of oxygen, and 30.97 g/mol for the molar mass of phosphorus.
Jlleblanc
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Jul 6, 2022
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What is the percent of phosphorus by mass in phosphoric acid,
H3PO4?
Use 1.008 g/mol for the molar mass of hydrogen, 16.00 g/mol
for the molar mass of oxygen, and 30.97 g/mol for the molar
mass of phosphorus.
Chemistry
high-school
Jlleblanc
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First find the total molar mass of H3PO4.
3H + 1P + 4O = 3(1.008) + 30.97 + 4(16.00) = 97.99 g/mol H3PO4
Then divide the molar mass of P in the compound by the total molar mass of the compound. Then multiply by 100% to make it a percent instead of a decimal.
30.97 / 97.99 • 100% = 31.61% phosphorus by mass
Zee
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Jul 12, 2022
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Zee
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