Use the structure to determine the molecular formula, molar mass, and percent by mass of sulfur in this compound.

Question

Use the structure to determine the molecular formula, molar mass, and percent by mass of sulfur in this compound.

molecular formula:CHSO

Answer 1

Molecular formula

1. add all the Carbons: 6
2. add all the Hydrogens: 10
3. add all the Sulfurs: 2
4. add all the Oxygens: 1

C₆H₁₀S₂O

molar mass = (molar mass carbon x 6) + (molar mass hydrogen x 10) + (molar mass sulfur x 2) + (molar mass oxygen x 1)

molar mass = 72 + 10 + 64 + 16 = 162 g/mol

Percent by mass of sulfur = (mass of all sulfurs in the compound) / (molar mass of compound)

Percent by mass of sulfur = (molar mass sulfur x 2) / (molar mass of compound)

Percent mass of sulfur = 64 / 162 = 0.395 -> 39.5%