massmoleprobs2 - Solomon's Study Notes General Chemistry I...

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S olomon’s Study Notes General Chemistry I Fall 2011 Solomon Weiskop PhD Practice Problems: Elemental Analysis & Combustion Analysis General Chemistry 1
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Study Notes & Practice Problems are available to print out by registering at www.solomonlinetutor.com Solomon Weiskop PhD © Copyright 2011
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1 [#1] The elemental analysis of a certain compound shows that its composition is 58.77% C 13.81% H and 27.42% N. Mass spectrometry data shows that its molar mass is between 200 and 220 g/mol. Use this information to determine the molecular formula for this compound. [#2] Cumene contains only carbon and hydrogen. Combustion of 47.6mg of cumene produces 156.8mg CO 2 and 42.8mg H 2 O. The molar mass of cumene is between 115 and 125 g/mol. What is the molecular formula of cumene? (a) C 3 H 4 (b) C 9 H 12 (c) C 9 H 9 (d) CH (e) none of these [#3] When 2.34g of pure iron is allowed to react with excess oxygen, 3.35g of the final compound is produced. Determine the formula of this compound.
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