The oxygen subgroup. Hydrogen sulfide
Answers are for parents and teachers.
1
Calculate the mass fraction of Zn in ZnS (Aᵣ: Zn 65, S 32), in % rounded to a whole number.
67 % (65 : 97 ≈ 0.67)
2
Mᵣ(FeS₂) = 120. How many grams of sulfur are in 360 g pyrite?
192 g
3
Analyse 2Na + S → Na₂S by electron balance.
Na⁰ – 1e⁻ → Na⁺ | 2; S⁰ + 2e⁻ → S²⁻ | 1; S is the oxidizing agent.
4
About what is the density of H₂S relative to air (Mᵣ = 34)?
34 : 29 ≈ 1.17
5
Why is a smelly additive put into natural gas?
So that a leak can be noticed at once by smell and danger avoided.