What is the molar mass of water (H₂O)? A 16 g/mol B 18 g/mol C 20 g/mol D 2 g/mol ✓ Correct Answer: Option B H₂O: 2(1.008) + 16.00 = 18.02 g/mol ≈ 18 g/mol. Practice AP Exam Prep Quizzes → Browse All Questions Study Flashcards