Find the mass and amount of oxygen, which reacts with 46 grams of sodium.
March 16, 2021 | education
| 1. Let’s write down the reaction equation:
All alkali metals except lithium form peroxides with oxygen.
2Na + O2 = Na2O2.
2. Find the amount of reacted sodium:
n (Na) = m (Na) / M (Na) = 46 g / 23 g / mol = 2 mol.
3. According to the reaction equation, we find the amount and then the mass of oxygen:
n (O2) = n (Na) / 2 = 2 mol / 2 = 1 mol.
m (O2) = n (O2) * M (O2) = 1 mol * 32 g / mol = 32 g.
Answer: n (O2) = 1 mol; m (O2) = 32 g.
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