3. Chemical Reactions

What is the percent by mass of hydrogen in NH_3 if the gram formula mass is 17.0 grams?

Based on the amounts of reactants used the calculated amount of product that can form for a given reaction was 20.76 g. When the reaction was carried out in a laboratory 17.34 g of product was recovered. What is the percent yield for this reaction?

What is the percent composition by mass of sulfur in the sulfate ion (SO_4^{2-})?

What is the mass percent of sodium (Na) in sodium hydrogen carbonate (NaHCO_3)?

Which of the following best represents the mass percent of Earth's water that is fresh water?

What is the mass percentage of carbon (C) in C2H2 (acetylene)? Provide your answer to two decimal places.

What is the mass percent of aluminum (Al) in aluminum sulfate, Al_2(SO_4)_3?

What is the percent by mass of potassium (K) in KMnO4?

What is the mass percent of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO_3)?

A sample of glucose (C6H12O6) has a molar mass of 180.16 g/mol. What is the percent composition of carbon in glucose?

What is the mass percent of oxygen in sodium carbonate (Na2CO3)?

How many grams of glucose are required to prepare 400 mL of a 2.0% (m/v) glucose solution?

A solution is 4.00% NaOH by mass. What mass of this solution contains 15.0 g of NaOH?

What is the percent by mass of potassium (K) in K3Fe(CN)6?