Find the volume of the evolved gas and the mass of the formed salt if nitrous acid and barium enter

Find the volume of the evolved gas and the mass of the formed salt if nitrous acid and barium enter into the reaction (the mass of nitrous acid is 64 grams)

Given:
m (HNO2) = 64 g
To find:
V (H2)
Decision:
2HNO2 + Ba = Ba (NO3) 2 + H2
n (HNO2) = m / M = 64 g / 47 g / mol = 1.36 mol
n (HNO2): n (H2) = 2: 1
n (H2) = 1.36 mol / 2 = 0.68 mol
V (H2) = n * Vm = 0.68 mol * 22.4 L / mol = 15.23 L
Answer: 15.23 L