Review starts with a brief explanation and examples. The answer key shows the setup for 28 of the % composition problems and the answers for all. This is great for introducing the concept, sending to homebound students, as well as for remediation and review. The 'problem' section is set up in a table format to help keep student work neat and tidy. There are 33 problems of various complexity.
The first column is set up for them to calculate molar mass & show their work. This makes the second column of % composition much easier - since they won't have to look up the mass of each element again.
Generally, by the end of this review, every student in the class has at least learned the pattern behind the calculations.