Peking university green card, eighth grade science, Zhejiang education edition, page 42, question 25, question 2, urgent need, please help! ! !
Solution: Let the mass of decomposed hydrogen peroxide be y, then:
2H2O2 = 2H2O + O2↑
68 32
y 32y/68
( 1000g * 30%-y)/( 1000g-32y/68)* 100% = 10%
D: y = 209.9g ≈2 10g。
Answer: The mass of this bottle of hydrogen peroxide after decomposition is 2 10g.