Sodium weighing 9.2 g completely reacted with water. Calculate the amount of gas evolved.

Let’s execute the solution:
1. According to the condition of the problem, we write down the equation:
2Na + 2H2O = 2NaOH + H2 – OBP, hydrogen is evolved;
2. Calculations:
M (Na) = m / M = 9.2 / 22.9 = 0.4 mol;
M (H2) = 2 g / mol.
3. Proportion:
0.4 mol (Na) – X mol (H2);
-2 mol – 1 mol from here, X mol (H2) = 0.4 * 1/2 = 0.2 mol.
4. Find the volume of H2:
V (H2) = 0.2 * 22.4 = 4.48 liters.
Answer: hydrogen was obtained with a volume of 4.48 liters.