Hydrogen peroxide Н2О2 decomposes into oxygen and water. How many grams of oxygen
| July 2, 2021 | education
Hydrogen peroxide Н2О2 decomposes into oxygen and water. How many grams of oxygen is formed from 13.6 g of peroxide.
Given:
m (H2O2) = 13.6 g
To find:
m (О2) -?
Decision:
1) 2H2O2 => 2H2O + O2 ↑;
2) n (H2O2) = m (H2O2) / Mr (H2O2) = 13.6 / 34 = 0.4 mol;
3) n (O2) = n (H2O2) / 2 = 0.4 / 2 = 0.2 mol;
4) m (O2) = n (O2) * Mr (O2) = 0.2 * 32 = 6.4 g.
Answer: The mass of O2 is 6.4 g.
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