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The decomposition of KClO3 produces oxygen gas and solid KCl. What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133 Celsius and .88 atm?

I know I need to use PV=nRT but I can't figure out how.

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2 answers
  1. Here is a worked example on the decomposition of KClO3. To convert 126 L O2 to n = mols, use PV = nRT and solve for n, then follow the instructions beginning with step 3.
    http://www.jiskha.com/science/chemistry/stoichiometry.html

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  2. thank you!

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