Calculate the amount of the substance and the number of H₂S hydrogen sulfide molecules with a mass of 5.1 g.
July 26, 2021
m (H2S) = 5.1 g.
N (H2S) -?
n (H2S) -?
M (H2S) = M (S) + M (H) = 32 + 2 = 34 g / mol.
n (H2S) = m / M = 5.1 g: 34 g / mol = 0.15 mol.
N (H2S) = Na × n = 6 × 10²³ × 0.15 mol = 0.9 × 10²³ = 9 × 10²² molecules.
Answer: 0.15 mol; 9 x 10²² molecules.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.