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A classmate found that the fish master sprinkled a yellowish solid into the fish pond. After consulting, he learned that the main component of this solid is calcium peroxide (CaO 2).

(1) Calcium peroxide reacts with water to produce calcium hydroxide and oxygen: 2cao2+2h2o = 2ca (OH) 2+O2 =.

(2) Let the mass of CaO 2 in 20g sample be x,

2CaO 2 +2H 2 O=2Ca(OH) 2 +O 2 ↑

144? 32

x？ 3.2g

∴ 144:32=x:3.2g，

Solution: x= 14.4g,

The mass fraction of CaO 2 in this sample is:14.4g 20g×100% = 72%.

A: The mass fraction of CaO 2 in this sample is 72%.

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