The rate of diffusion of hydrogen is about:A. One half that of HeB. 1.4 times that of HeC. Twice that of HeD. Four times that of He

The rate of diffusion of gases is determined by Graham's law of diffusion, which states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass.

The molar mass of hydrogen (H2) is approximately 2.016 g/mol, and the molar mass of helium (He) is approximately 4.003 g/mol.

Now, let's compare the rates of diffusion of hydrogen (H2) and helium (He) using Graham's law:

Rate of diffusion of hydrogen (RH2) / Rate of diffusion of helium (RHe) = √(Molar mass of helium / Molar mass of hydrogen)

RH2 / RHe = √(4.003 g/mol / 2.016 g/mol) ≈ √2 ≈ 1.41

So, the correct answer is B. 1.4 times that of He. The rate of diffusion of hydrogen is approximately 1.4 times that of helium.