Question

Suppose a chemist has chosen 1020 as the number of particles in a mole. What would be the molecular mass of oxygen gas?

Answer 1

Answer:

5.31×10−3g

Solution :

6.022×1023 molecules of oxygen weigh = 32 g

1.0 molecule of oxygen weighs =326.022×1023=5.31×10−23g

∴ Mass of 1020 molecules of oxygen =5.31×10−23×1020=5.31×10−3g.