Practice Mole in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
The fundamental counting unit in chemistry, defined as exactly particles (atoms, molecules, ions, or other entities).
A 'chemist's dozen'—a huge number that makes atom-counting practical.
Showing a random 20 of 50 problems.
Example 1
mediumOrder by particle count: 1 mol , 0.5 mol , 2 mol atoms.
Example 2
mediumHow many particles are in ?
Example 3
easyHow many particles are in of molecules?
Example 4
easyHow many moles are in atoms of carbon?
Example 5
challengeTwo samples have equal particle counts: sample A is , sample B is . If A is mol, how many molecules does B have?
Example 6
easyA sample contains mol of a substance. How many particles is that?
Example 7
mediumHow many moles is molecules of ?
Example 8
mediumHow many moles of atoms are in 3 moles of ?
Example 9
easyHow many moles of atoms are in 4 moles of molecules?
Example 10
easyA sample contains molecules of ammonia. How many moles of is this?
Example 11
challengeA sealed bulb at STP contains of a mixture that is and by volume. How many total atoms are in the bulb? ()
Example 12
challengeHow many total atoms are in mol of ?
Example 13
mediumIf 1 mol weighs , how many atoms are in of ?
Example 14
hardHow many chloride ions are released when of dissolves fully in water?
Example 15
easyWhat is a mole and why is it useful in chemistry?
Example 16
mediumAt STP, how many moles of an ideal gas occupy ? ()
Example 17
mediumHow many moles of water are in g of ? (Molar mass of )
Example 18
mediumHow many oxygen atoms are in of glucose ()?
Example 19
easyIs '1 mole of oxygen' fully specified? Why or why not?
Example 20
mediumHow many sodium ions are in of ?