Acidic residue in paper from the manufacturing process causes paper based on wood pulp to age and deteriorate. To neutralize the paper, a vapor-phase treatment must employ a compound that would be volatile enough to permeate the fibrous structure of paper within a mass of books but that would have a chemistry that could be manipulated to yield a mildly basic and essentially nonvolatile compound. George Kelly and John Williams successfully attained this objective in 1976 by designing a mass deacidification process employing gaseous diethyl zinc (DEZ).
At room temperature, DEZ is a colorless liquid. It boils at 117°C. When it is combined with oxygen, a highly exothermic reaction takes place:
(C2H5)2Zn + 7O2 → ZnO + 4CO2 + 5H2O
Because liquid DEZ ignites spontaneously when exposed to air, a primary consideration in its use is the exclusion of air. In one case a fire caused by DEZ ruined the neutralization center.
Is the equation shown balanced? If not, balance it. How many kilograms of DEZ must react to form 1.5 kg of ZnO? If 20 cm3 of water are formed on reaction, and the reaction was complete, how many grams of DEZ reacted?
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