Calculate the amount of the substance and the number of H₂S hydrogen sulfide molecules with a mass of 5.1 g.

univerkov | July 26, 2021 | education

Given:
m (H2S) = 5.1 g.
To find:
N (H2S) -?
n (H2S) -?
Solution:
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.

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