One difference between mixtures and pure substances is that A) mixtures can be physically separated. B) mixtures are made of one
2 answers:
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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.