No . of gram atoms in 1kg of Helium

Calculate the number of atoms in 1g of helium

How many grams of carbon and oxygen are required to get the same number of atoms as in one gram of Helium?

'The number of atoms in 1 mole of hydrogen is twice the number of atoms in 1 mole of helium, at the same temperature and pressure." Why ?

Calculate the mass of 1.5gram atoms of calcium?

Calculate (a) Mass of 2.5 gram atoms of magnesium, (b) Gram atoms in 1.4 grams of nitrogen (Atomic mass : Mg = 24,N=14 )

What is the number of helium atoms in 1 mole He?