Calculate the volume of hydrogen, which is formed by the interaction of 9.2 g of sodium

Calculate the volume of hydrogen, which is formed by the interaction of 9.2 g of sodium, containing 2.5% impurities, with water. Calculate the amount of alkali that you get.

1. Let’s compose the equation of the proceeding reaction:

2Na + 2H2O = 2NaOH + H2 ↑;

2.Calculate the mass of pure sodium in the sample:

m (Na) = (1 – w (impurities)) * m (sample) = 0.975 * 9.2 = 8.97 g;

3. find the chemical amount of sodium:

n (Na) = m (Na): M (Na) = 8.97: 23 = 0.39 mol;

4.determine the amount of released hydrogen:

n (H2) = n (Na): 2 = 0.39: 2 = 0.195 mol;

5.Calculate the volume of hydrogen:

V (H2) = n (H2) * Vm = 0.195 * 22.4 = 4.368 l.

Answer: 4.368 liters.