Calculate the mass percent composition of each of the following:
a. CaCl2, calcium chloride
b. Na2Cr2O7, sodium dichromate
c. C2H3Cl3, trichloroethane, a cleaning solvent
d. Ca3(PO4)2, calcium phosphate, found in bone and teeth
e. C18H36O2, stearic acid, a fatty acid
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