about 3.4 × 10²³
Step-by-step explanation:
CBr⁴ 's molar mass is : 331.63 gr/mol
so 189gr of it means : 189/331.63 = 0.56 mol of CBr4
as we know each mole approximately contains
6.022 × 10²³ molecules
0.56 × 6.022 × 10²³ = 3.3723 × 10²³
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