MHT CET202611 April 2026Morning ShiftChemistrySome Basic Concepts of ChemistryActual
Calculate the mass of 100 molecules of oxygen in amu and in grams.
Options
- A3200 u and 5.314 10⁻²¹ g
- B1600 u and 2.657 10⁻²¹ g
- C32 u and 1.328 10⁻²¹ g
- D8 u and 3.978 10⁻²¹ g
Correct answer
A. 3200 u and 5.314 10⁻²¹ g
Step-by-step solution
Mass of one oxygen molecule ( O₂ ) = 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