PLEASE HELP ME

what would be the mass of 9.03 x 1021 molecules of hydrobromic acid (HBr)?

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.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

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