Question
Calculate the mass of 100 molecules of oxygen in amu and in grams.
MHT CET
Chemistry
Some Basic Concepts of Chemistry
2026
MHT CET 2026 (11 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 3200 u and 5.314 10^ -21 g
- B. 1600 u and 2.657 10^ -21 g
- C. 32 u and 1.328 10^ -21 g
- D. 8 u and 3.978 10^ -21 g
Answer
A. 3200 u and 5.314 10^ -21 g
Step-by-step solution
Mass of one oxygen molecule (O_2) = 2 16 u = 32 u. Mass of 100 oxygen molecules = 100 32 u = 3200 u. Since 1 u = 1.6605 10^ -24 g, the mass in grams is given by: Mass = 3200 1.6605 10^ -24 g = 5.314 10^ -21 g. Answer: 3200 u and 5.314 10^ -21 g
Related: Chemistry — Some Basic Concepts of Chemistry · All PYQ Banks