5 Answered Questions for the topic Mass Percent

02/10/21

A mixture of KClO3 and KCl with a mass of 0.950 g was heated to produce O2. After heating, the mass of residue was 0.740 g. Assuming all the KClO3 decomposed to KCl and O2, calculate the mass percent
of KClO3 in the original mixture
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02/10/21

A person's blood alcohol (C2H5OH) level can be determined by titrating a sample of blood plasma with a potassium dichromate solution. The balanced equation is
16H+(aq) + 2Cr2O72-(aq) + C2H5OH(aq) > 4Cr3+(aq) + 2CO2(g) + 11H2O(l)If 35.46 mL of 0.05961 M Cr2O72- is required to titrate 27.90 g of plasma, what is the mass percent of alcohol in the... more
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02/09/21

The mass percent of Cl− in a seawater sample is determined by titrating 25.00 mL of seawater with AgNO3 solution, causing a precipitation reaction....
An indicator is used to detect the endpoint, which occurs when a free Ag+ ion is present in a solution after all the Cl− has reacted. If 57.50 mL of 0.2036 M AgNO3 is required to reach the... more
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02/02/21

A 2.004-gram sample of calcium is completely reacted with oxygen to produce 2.804 g of calcium oxide. What is the mass percentage of oxygen in calcium oxide?
I got 28.5 percent. Is that correct?
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01/27/16

CHEM HELP PLEASE? Solution problem involving mass percent? What is the mass % of ammonium chloride in the solution?
At 20°C, a 3.54 M aqueous solution of ammonium chloride has a density of 1.0512 g/mL. The formula weight of NH4Cl is 53.50 g/mol.options:6.953.360.2974.1018.00I know mass % = mass of solute/mass of... more
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