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Calculate the percent by mass of the element listed first in the formulas for each of the following compounds.
a. iron(III) chloride
b. oxygen difluoride, OF2
c. benzene, C6H6
d. ammonium perchlorate, NH4ClO4
e. silver oxide
f. cobalt(II) chloride
g. dinitrogen tetroxide
h. manganese(II) chloride

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