H3PO4, Phosphoric acid, is used in detergents, fertilizers, toothpastes and flavoring in carbonated beverages. Calculate the percent composition by mass to two decimal places of H, P and O in this compound.
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Hydrogen atomic mass : 1 amu
Oxygen atomic mass: 16 amu
Phosphorus atomic mass : 31 amu (30.97+)
compound: H3 PO4: Total = 3 * 1+ 31 + 16 * 4 = 98 amu
% by mass of Hydrogen: 100*1/98 = 1.02 %
of Oxygen: 100* 64 /98 = 65.31 % rounded number
of Phosphorous: 100* 31 / 98 = 31.63%
Oxygen atomic mass: 16 amu
Phosphorus atomic mass : 31 amu (30.97+)
compound: H3 PO4: Total = 3 * 1+ 31 + 16 * 4 = 98 amu
% by mass of Hydrogen: 100*1/98 = 1.02 %
of Oxygen: 100* 64 /98 = 65.31 % rounded number
of Phosphorous: 100* 31 / 98 = 31.63%
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Answer:
Hydrogen atomic mass : 1 amu
Oxygen atomic mass: 16 amu
Phosphorus atomic mass : 31 amu (30.97+)
compound: H3 PO4: Total = 3 * 1+ 31 + 16 * 4 = 98 amu
% by mass of Hydrogen: 100*1/98 = 1.02 %
of Oxygen: 100* 64 /98 = 65.31 % rounded number
of Phosphorous: 100* 31 / 98 = 31.63%
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