Answer
See answer below.
Work Step by Step
a) Reactants: $C_6H_6O_9$, $222.10\ g/mol$
Product: $98.06\ g/mol$
Atom economy: $98.06/222.10\times100\%=44.2\%$
b) Number of moles of benzene:
$1000\ g\div78.11\ g/mol=12.80\ mol$
Mass of maleic anhydride:
$12.80\ mol\times 98.06\ g/mol=1255.3\ g$
Percent yield:
$972/1255.3\times100\%=77.4\%$
