Calculate the mass of ammonium sulfate formed by the reaction of ammonia with 100 g of a 20% sulfuric acid solution.

1. Let’s compose the reaction equation:
2NH3 + H2SO4 = (NH4) 2SO4;
2.Calculate the mass of sulfuric acid:
m (H2SO4) = w (H2SO4) * m (solution) = 0.2 * 100 = 20 g;
3. find the chemical amount of acid and ammonium sulfate:
n (H2SO4) = m (H2SO4): M (H2SO4);
M (H2SO4) = 2 + 32 + 4 * 16 = 98 g / mol;
n (H2SO4) = 20: 98 = 0.2041 mol;
n ((NH4) 2SO4) = n (H2SO4) = 0.2041 mol;
4. calculate the mass of sulfate:
m ((NH4) 2SO4) = n ((NH4) 2SO4) * M ((NH4) 2SO4);
M ((NH4) 2SO4) = 28 + 8 + 32 + 4 * 16 = 132 g / mol;
m ((NH4) 2SO4) = 0.2041 * 132 = 26.94 g.
Answer: 26.94 g.