How many moles of oxygen present in 1000gms of `CaCO_3`?

Find out the mass of one mole of CaCO_3 . How many moles of calcium present in 1000g CaCO_3 ?

How many moles of oxygen are present in 400 cm^3 sample of a gas at a pressure of 760 mm Hg at a temperature of 27^@C ?

How many moles of dioxygen are present in 64 g of dioxygen? (Molecular mass of dioxygen is 32)

How many moles of dioxygen are present in 64 g of dioxygen?(Molecular mass of dioxygen is 32).

How many moles of dioxygen are present in 64g of dioxygen? (Molecular mass of dioxygen is 32)

How many H_2O molecules are present in 90g of water

How many moles of CI_2 present in 11.2L of same in STP? Find out the mass of this?

How many number of moles are there in 1 g of Ca

How many atoms are present in 12g carbon?

How many molecules of water are present in one mole of water?