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Course: High school chemistry > Unit 4

Lesson 3: Stoichiometry
Science
High school chemistry
Stoichiometry and the mole
Stoichiometry
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Apply: mass to mass stoichiometry

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Problem

Table salt, or sodium chloride, can be decomposed into sodium metal and chlorine gas by running electricity through molten NaCl.
An illustration of a device that breaks liquid N-A-C-L down into sodium and chlorine.
A Downs cell produces sodium and chlorine from molten sodium chloride.
The balanced equation for this reaction is:
2NaCl(l)→2Na(l)+ClA2(g)
If 42.8 grams of ClA2 are produced by the above reaction, what mass of NaCl reacted?
Report your answer to two decimal places.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
grams NaCl