Practice exercises in Stoichiometry with detailed answers; A revision guide..

PRACTICE EXERCISES

on
STOICHIOMETRY
1
CHEMICAL FORMULAS
and
COMPOSITION STOICHIOMETRY



By
Temple C. Eke

, A. The Mole and Molar Mass.

1. Calculate the molar mass of each of the following compounds:
(a)
(b)
(c)
(d)
(e)




2. A sample of iron has a mass of . Calculate the:
(a) number of moles present.
(b) number of iron atoms present.



3. A sample of Hydrogen gas has a mass of . Calculate the:
(a)number of hydrogen molecules present.
(b)number of hydrogen atoms present.



4. What mass of Nitrogen gas at would contain:
(a) molecules of Nitrogen ?
(b) atoms of Nitrogen?



5. Calculate the average mass in grams of:
(a)one Oxygen atom.
(b)one Calcium atom.



B. Percent Composition and Formulas of Compounds.

6. Find the percentage composition by mass of each of the following
compounds:
(a)
(b)