3. Chemical Reactions

What is the mass percent of hydrogen in methane (CH_4)?

What is the mass percent of Mg in the compound Mg_3(PO_4)_2?

Which of the following best describes what mass measures in chemistry?

Which of the following statements about mass is correct?

What is the mass percent of oxygen in water (H_2O)?

What is the percent by mass of magnesium in MgO?

What is the mass percent of aluminum in the compound Al2O3?

What is the approximate mass percent of nitrogen and oxygen in nitrogen dioxide (NO_2)?

What is the mass percent of carbon (C) in C2H6O (ethanol)? Provide your answer to two decimal places.

What is the mass percent of chlorine in hydrochloric acid (HCl)?

Caffeine has the molecular formula C8H10N4O2. What is the mass percent of carbon (C) in caffeine?

The chemical formula for glucose is C_6H_{12}O_6. What is the percent by mass of hydrogen in glucose?

If a piece of paper has a mass of 4.4 grams and contains 0.22 grams of carbon, what is the mass percent of carbon in the paper?

What is the mass percent of lithium in lithium nitride (Li3N)?

What is the mass percent of F in the binary compound KrF_2?