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how to calculate the no of atoms in 52 moles of helium (answer little breafly)

The molar mass of helium is 4 g. Thus the mass of one mole of helium atoms (6.023 X 10²³ atoms of helium) is 4g. Hence 

 4 g of helium atoms = 1 mole of helium atoms

 1g of helium atoms = (1/4) moles of helium atoms

 52g of helium atoms = (1 X 52)/4 moles of helium atoms

 = 13 moles of helium atoms.