Question

How many moles of O2 are there in 2500g of O2?

Answer 1

Mole is a number that connects mass of a substance with its number of particles.

1 mole of a substance = 6.02 x `10^23` particles (entities)

1 mole of Dioxygen or `O_2` = 6.02 x `10^23` molecules of `O_2`

1 mole of `O_2` has mass 32 g

we can say that

32 g of `O_2` = 1 mole

1g of `O_2` = 1/32 mole

2500 g of `O_2` = 1/32 x 2500 = 78.125 moles.