How much oxygen is needed to burn 4.6 grams of sodium (Na)?

univerkov | August 7, 2021 | education

1. Let us write down the reaction equation (it must be remembered that peroxide is formed when alkali metals are burned, with the exception of lithium):

2Na + O2 = Na2O2.

2. Find the amount of sodium:

n (Na) = m (Na) / M (Na) = 4.6 g / 23 g / mol = 0.2 mol.

3. Using the equation, we find the amount of oxygen and its volume (Vm – molar volume, constant equal to 22.4 mol / l):

n (O2) = 0.5n (Na) = 0.1 mol.

V (O2) = n (O2) * Vm = 0.1 mol * 22.4 mol / L = 2.24 L.

Answer: V (O2) = 2.24 liters.

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