When sodium bicarbonate was heated, 2.24 liters of carbon dioxide was released.

When sodium bicarbonate was heated, 2.24 liters of carbon dioxide was released. What is the mass fraction of sodium bicarbonate?

Let’s implement the solution:

According to the condition, we write down the equation of the process:
NaHCO3 = CO2 + Na2CO3 + H2O – decomposition, carbon dioxide is released;

Let’s make the calculations:
M (NaHCO3) = 83.9 g / mol;

M (CO2) = 44 g / mol.

Proportion:
1 mol of gas at normal level – 22.4 liters;

X mol (CO2) -2.24 L from here, X mol (CO2) = 1 * 2.24 / 22.4 = 0.1 mol.

Y (NaHCO3) = 0.1 mol since the amount of substances is 1 mol.

We find the mass and yield of the original substance:
m (NaHCO3) = Y * M = 0.1 * 83.9 = 8.39 g (practical weight);

m (NaHCO3) = 1 * 83.9 = 83.9 g (theoretical weight);

W = m (practical) / m (theorem.) 100;

W = 8.39 / 83.9 * 100 = 10%

Answer: the yield of sodium bicarbonate is 10%