I think the correct answer is b. Temperature is proportional to the average kinetic energy so when temperarure rises so will the average kinetic energy. I hope this helps. Let me know if anything is unclear.
We know 1 mole of any atom or molecules contains
atom or molecules.
1 mole of HBr i.e 81 gm/mol contains
atom or molecules.
So, mass of
molecules is :

Therefore, mass of
molecules is 1.21 gm .
Hence, this is the required solution.
Answer:
E. HCl
Explanation:
Cl atom does not have enough electronegativity to make enough positive charge on H.
1.123 * 10^3 thatsssss it