1. The problem statement, all variables and given/known data It is estimated that a particular diffuse hydrogen cloud has a particle density of 3e7 cm^-3, and the temperature is 150 K. Calculate Jeans mass. 2. Relevant equations Jeans mass is given by: (5kT/GmewM(H))^(3/2) . (3/4∏p)^(1/2) where k = boltzmanns constant = 1.38e-23 T = temperature in Kelvin = 150K G = Gravitational constant = 6.673e-11 mew = mean molecular weight = ? m(H)= mass of gas particles = ? p = cloud mass density = ? 3. The attempt at a solution I know I just have to fill in the formula, so it should be simple, but I'm really having trouble calculating the parts of the formula. I don't have a clue about mean molecular weight OR mass of gas particles, and I THINK the 'cloud mass density' is the number given in the question (3e7 cm^-3) but I don't understand how to convert that to metres (the unit cm^-3 is throwing me off. I really want to calculate this as accurately as I can, could anyone help please? Thank you.