Question

If 1 gram of oxygen gas contains x molecules, how many molecules will be present in 1 Gram of helium gas?

Answer 1

helium is a noble gas is contain 0 molecules

Answer 2

But if it's helium with about 4 AMU per atom, then that 1 gram holds 1/4 as many helium atoms as the 1 gram ofhydrogen. Therefore there are 0.25moles of atoms there. As others have indicated, the number for 1 mole = 6.022 x 10^23.