The volume of gas released during treatment with sodium is 30 g of formic acid.

1. Let us write down the equation of the reaction occurring during the treatment with sodium formic acid:

2HCOOH + 2Na → 2HCOONa + H2 ↑;

2.Calculate the chemical amount of formic acid:

n (HCOOH) = m (HCOOH): M (HCOOH);

M (HCOOH) = 1 + 12 + 32 + 1 = 46 g / mol;

n (HCOOH) = 30:46 = 0.6522 mol;

3. Determine the amount of hydrogen:

n (H2) = n (HCOOH): 2 = 0.6522: 2 = 0.3261 mol;

4. find the volume of the evolved gas:

V (H2) = n (H2) * Vm = 0.3261 * 22.4 = 7.3 liters.

Answer: 7.3 liters.