3. Chemical Reactions

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.

What is the mass percent of aluminum (Al) in aluminum sulfate, Al2(SO4)3?

Which of the following compounds has the highest mass percent of oxygen?

Which of the following compounds has the largest mass percent of oxygen?

What volume of a 10.00% (w/v) solution of sugar is needed to provide 2.00 g of sugar?

What is the percent by mass of sulfur in aluminum sulfate (Al_2(SO_4)_3)?

What is the mass-volume percent (m/v %) of a solution containing 29.0 g of calcium sulfate dissolved in 103 mL of solution?

What is the percent by mass of sodium in NaCl? Choose the closest value.

What is the percent by mass of carbon in C_{10}H_{14}N_{2}?

An oxide of iron has the formula Fe_3O_4. What is the mass percent of iron in Fe_3O_4?

Which element has a mass percent composition of 21.49% in borax (Na2B4O7·10H2O)?

What is the percent by mass of carbon in acetone (C3H6O)?

A 70.0-g iron nail combines with 30.0 g of oxygen to form rust. What is the total mass of the iron nail plus the rust that forms?

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be: