(2011?Jiaxing) As shown in the figure, someone made a home oxygen production device. The oxygen device consists of two beverage bottles, two hoses and pharmaceutical composition, the whole set of

(1) If the A hose in the bottle A deep below the liquid level, it will not be able to export the gas. In order to successfully export the oxygen produced in bottle A, A hose in bottle A should not reach the surface of the liquid. Therefore, the answer is: do not reach the surface of the liquid;

(2) According to the chemical reaction formula can be seen, these two reactions are from a substance to produce other two other substances decomposition reaction. Therefore, the answer is: decomposition;

(3) solution: the mass of oxygen that can be produced m

2H2O2

? MnO2? .

?

2H2O+O2↑

68 32

34g ?m

68

34g

=

32

m

m=16g

Answer: the mass of oxygen that can be produced is 16g.

.