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.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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