Try going to these sites and practicing conversions and checking your answer. As my email indicated we will review this material next week and a re-take will be available to all students who got a C or below.
Mass-mole conversions practice test http://www.softschools.com/quizzes/chemistry/mass_mole_conversions/quiz1122.html
More practice problems
http://www.algebralab.org/practice/practice.aspx?file=Algebra_MoleProblems2.xml
More practice problems with answer key (don't do 7 or 8)
http://www.chemistry.wustl.edu/~coursedev/Online%20tutorials/Plink/moleskey.htm
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