Answer
The temperature of the hydrogen gas will rise faster.
Work Step by Step
Section 18.4 and Table 18.1 discuss the heat capacities of gases. A mole of diatomic gas (hydrogen) will have a lower heat capacity than a mole of polyatomic gas ($UF_6$).
If heat is added at equal rates to 2 systems, the system with the smaller heat capacity will change temperature at a faster rate.
