Atomic Mass and Molecular Mass MCQs
Practice Atomic Mass and Molecular Mass multiple-choice questions from Atoms and Molecules (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Atomic Mass and Molecular MassQuiz - Solve & Score
Q1. A lab technician weighs out pure glucose C6H12O6 for a respiration demo. What is the molecular mass of C6H12O6 in u?
- A.169
- B.29
- C.179
- D.180
Answer: D. 180
Add atomic masses for every atom: 6x12 + 12x1 + 6x16 = 180 u.
Q2. A chemist dissolves table salt NaCl to prepare a saline solution. Summing the atomic masses of every constituent atom, what molecular mass does NaCl have, in u?
- A.81.5
- B.59.5
- C.35.5
- D.58.5
Answer: D. 58.5
Add atomic masses for every atom: 1x23 + 1x35.5 = 58.5 u.
Q3. A gardener checks the label on a bag of urea CO(NH2)2 fertiliser. What does one formula unit of molecular mass weigh on the relative atomic-mass scale, giving its CO(NH2)2 in u?
- A.60
- B.57
- C.59
- D.43
Answer: A. 60
Add atomic masses for every atom: 1x12 + 1x16 + 2x14 + 4x1 = 60 u.
Master Atomic Mass and Molecular Mass on RankByte
Step-by-step solutions, mock tests, live ranks and streaks - free to start.
Get early access