3. Chemical Reactions

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?

Morphine has the molecular formula C17H19NO3. What is the mass percent of oxygen in morphine?

What is the mass percent of carbon in carbon monoxide (CO)?

What is the mass percent of water in Ca(NO3)2 · 4 H2O? Provide your answer to two decimal places.

A 20.0 mL sample of a 15.5% (m/v) KBr solution is taken. What mass of KBr (in grams) is present in this sample?

What is the mass percent of phosphorus in Zn3(PO4)2?

Codeine has the molecular formula C17H19NO3. What is the mass percent of carbon (C) in codeine?

Which one of the following compounds has the smallest mass percent of fluorine (F)?

What is the mass percent of oxygen in C2H6O (ethanol)?