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Exam (elaborations)

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

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2020/2021 Written for academic year
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A revision guide to help the student review the principles of stoichiometry. Serves as assessment material to test the understanding of the topic. the answers to the problems are presented with useful hints to guide the student. Suitable for students in High School, and the first year in university.

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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)

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Subjects

  • stiochiometry
  • chemical calculations
  • physical chemistry
  • analytical chemistry
  • composition stoichiometry

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