please provide me the correct answer with the explaination.

2. (15 points) Using the data given below and in slide (lecture 31 page 8 ), compute the molecular weights of: (note that use the significant number as much as you can) a. H2 gas b. H2O c. H2O2 3. (20 points) How many atoms of 234U are there in 10kg of natural uranium if the natural abundance of 234U is 0.0055% ? 4. (10 points) Compute the neutron-proton mass difference in MeV 5. (40 points) Show that the speed of any particle, relativistic or nonrelativistic, is given by the following formula: v=c1Etotal2Erest2