How many molecules are in 5.75 mol hbr

3.46 x 10²⁴ molecules.

Explanation:

Using cross multiplication:

1.0 mole of HBr → 6.022 x 10²³ molecules.

5.75 mole of HBr → ??? molecules.

∴ The no. of molecules of HBr are in 5.75 mol = (6.022 x 10²³ molecules) ( 5.75 mole) / (1.0 mol) = 3.46 x 10²⁴ molecules.

thats a little if u want the answer just look it up on google thats what i do haha : )