Question

Isopropyl alcohol, (CH3)2CHOH, is a common solvent. Determine the percent by mass of hydrogen in isopropyl alcohol. A) 6.71% H B) 13.4% H C) 25.0% H D) 53.3% H

Answer 1

Answer:

B) 13.4 %.

Explanation:

• Isopropyl alcohol has the general molecular formula C₃H₈O.

• Its molar mass = 60.1 g/mol.

• The percent by mass of H = [(no, of H atoms x molar mass of H) / (molar mass of isopropyl alcohol)] x 100 = [(8.0 atoms x 1.0 g/mol) / (60.1 g/mol)] x 100  = 13.333 % ≅ 13.4 %.