This is the correct answer but I dont understand how to get there

For the translational partition functions assume qtrans=3. Calculate qtransPqtransH2qqtrans Assume T=300K. Asume the atomic weight of F is 19g/mole - Hint 1. A useful fact: the thermal wavelenght of monatomic hydrogen at T=1000K is H=5.521011m Correct A ratio of 4.221031m3 is a typica ratio which is usually in the neighborhood of 1030m3