http://www.ck12.org Chapter 10. The Mole
Lesson Review Questions
Reviewing Concepts
- What is Avogadro’s number and what does it represent?
- What is the representative particle for each of the following substances?
a. barium chloride
b. silicon
c. nitrogen gas
d. water - How many oxygen atoms are there in a representative particle of each of the following substances?
a. KClO 4
b. CH 3 COOH
c. Al(NO 3 ) 3 - What is wrong with the following statements?
a. A mole of any substance contains the same number of atoms.
b. One mole of water contains Avogadro’s number of atoms. - If the atomic mass of a certain element is 69.72 amu, what is its molar mass?
Problems
- Calculate the number of representative particles in each of the following.
a. 0.0391 mol Ne
b. 3.72 mol NH 3
c. 8.00 mol CaF 2
d. 1.35× 10 −^4 mol Pb^2 + - Calculate the number of moles represented by each of the following quantities.
a. 3.11× 1024 molecules of NO 2
b. 8.06× 1021 atoms of Pt - How many iodine atoms are in 2.45 mol of BaI 2?
- Calculate the molar masses of the following substances.
a. PCl 3
b. BaCO 3
c. Fe 2 (SO 4 ) 3
d. Pb(CH 3 COO) 2 - 3.50 moles of a certain compound contains 1.05× 1025 carbon atoms. How many carbon atoms are in the
formula of this compound?
Further Reading / Supplemental Links
- Kieffer, W.F.,Mole Concept in Chemistry, Van Nostrand Reinhold Company, 1973.
- NationalMoleDayFoundation,INC., (http://www.moleday.org/
- MolarMassCalculator, (http://www.webpc.org/mmcalc.php