What is the mass fraction of sulfur in sulfurous acid?
| February 23, 2021 | education
Given:
Sulfurous acid – H2SO3
To find:
ω (S in H2SO3) -?
Decision:
1) Using the periodic system of D.I.Mendeleev, calculate the molar mass of sulfurous acid:
Mr (H2SO3) = Ar (H) * N (H) + Ar (S) * N (S) + Ar (O) * N (O) = 1 * 2 + 32 * 1 + 16 * 3 = 82;
2) Calculate the mass fraction of sulfur in sulfurous acid:
ω (S in H2SO3) = N (S in H2SO3) * Ar (S) * 100% / Mr (H2SO3) = 1 * 32 * 100% / 82 = 39%.
Answer: Mass fraction of sulfur in sulfurous acid is 39%.
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