Question

Which sample of argon gas has the same number of atoms as a 100. -milliliter sample of helium gas at 1. 0 atm and 300. K?.

Answer 1

one mole of each gas has the same number of molecules (Avogadro's No)

i mole He = 4 grams

1 mole Argon = 38 grams

1 mole Argon / 1 mole He = 9.5

one would need 950 ml of Ar gas