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**Literature
Abstracts**

1702. ---------------. [KAWAKITA, K.] [Kinetics of
the Reduction of Ferric Oxide.] Rev.
Phys. Chem. Japan, vol. 14, 1940, pp. 79-85; Chem. Abs., vol. 35, 1941, p. 961.

Rate of reduction of Fe_{2}O_{3}
by H_{2}, *dx/dt*, measured in a
static system, equals *kx*^{n} (a-x),
where *x* is the amount of H_{2}
reacted, *a* is the initial H_{2}
concentration, *k* is the rate constant,
and *n* is a topochemical factor related
to the number of reaction nuclei and to their rate of propagation.
At 500° and 600°, many nuclei are formed at the start of the reaction
and *n*=0, and the reaction is approximately 1^{st} order.
At 265° very few nuclei are formed initially and *n*=1,
giving a maximum rate when *x=a/*2.
*n* decreases as *k*
increases. As the temperature increases above 265° the maximum rate is
larger and appears earlier.

KAWAMICHI, K.
*See* abs. 1854.