Zn + H2SO4 = ZnS04 + 2 H
98 2 | Make the proportion, and solve
x 12
Solve:—
(1) How much H in 200 g. H2S04?
(2) How much ZnS04 is produced from 200 g. H2S04? (3) How much H2S04 is needed for 7 1/2 g H? (4) How much Zn will 40 g. H2SO4 combine with? (5) How much Fe will 40 g. H2SO4 combine with? (6) How much H can be obtained by using 75 g Fe?
These principles apply to all reactions. Suppose, for example, we wish to get l0 g. of O: how much KClO3 will it be necessary to use? The reaction is:—
KClO3 = KCl + O3 | 48 : 10 :: 122.5 : x 122.5 48 | x 10 | Ans. 25.5+ g. KClO3.
The pupil should be required to make up problems of his own, using various reactions, and to solve them.
CHAPTER X.
CARBON.
Examine graphite, anthracite coal, bituminous coal, cannel coal, wood, gas carbon, coke.