3. Chemical Reactions

Mass Percent

Open Question
Which element is in the greatest amount in what is referred to as a starter fertilizer?
Multiple Choice
What is the percent by mass of sodium (Na) in sodium chloride (NaCl)? Use the atomic masses: Na = 22.99 g/mol, Cl = 35.45 g/mol.
Multiple Choice
What is the mass percent of aluminum (Al) in aluminum sulfate, Al2(SO4)3?
Multiple Choice
Which of the following compounds has the highest mass percent of oxygen?
Multiple Choice
What is the mass percent (m/m%) of a solution if 20 grams of solute is dissolved in 80 grams of solvent?
Multiple Choice
What is the mass percent composition of carbon in carbon dioxide (CO2)?
Multiple Choice
Which of the following compounds has the largest mass percent of oxygen?
Open Question
What is the percentage of nitrogen, by mass, in calcium nitrate?
Multiple Choice
What volume of a 10.00% (w/v) solution of sugar is needed to provide 2.00 g of sugar?
Multiple Choice
A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be:
2
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Multiple Choice
A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution. Calculate the mass percent of NaCl in the solution if the density of the solution is 1.06 g/mL.
Open Question
What is the percent composition for carbon and hydrogen in ethane C₂H₆?
Multiple Choice
What is the percent by mass of sulfur in aluminum sulfate (Al_2(SO_4)_3)?
Multiple Choice
What is the mass-volume percent (m/v %) of a solution containing 29.0 g of calcium sulfate dissolved in 103 mL of solution?
Open Question
Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds.