1. The problem statement, all variables and given/known data At what temperature will Cl2 molecules have sufficient velocity to escape the Earth’s gravitational pull? The escape velocity from the Earth is 25,000 mph. (Note: Cl2 is diatomic, so you’ll need to double the atomic weight shown on the periodic table.) Cl=35.5g/mol v=11.2km/s 2. Relevant equations v=√3kT/m 3. The attempt at a solution Cl=35.5g/mol Cl2≈71g/mol = 0.071kg/mol .071kg/mol/6.02x10^23=1.18x10^-25 11.2km/s=√3(1.38x10^-23)T/(1.18x10^-25) This is where I am stuck. I don't know where to go from here. I'm not looking for an answer, just an explanation of the steps. My professor doesn't explain anything. Thank you!