What mass of oxygen is formed by the decomposition of 17 grams of hydrogen peroxide?

univerkov | July 17, 2021 | education

Given:
m (H2O2) = 17g
m (O2) -?
Decision:
1. We make a chemical equation:
2H2O2 -> 2H2O2 + O2
2. Find the molar masses of substances:
M (H2O2) = 1 * 2 + 16 * 2 = 34g
M (O2) = 16 * 2 = 32g
3. We make up the proportion:
17g – hg
2 * 34g – 32g
x = (17 * 32) / (2 * 34) = 8g
Answer: 8g is the mass of oxygen.

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