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gogolik [260]
3 years ago
5

The percentage by mass of Br in the compound

Chemistry
2 answers:
tino4ka555 [31]3 years ago
8 0
What you have to do it find the percentage / solve it. Divide the mass by the entire mass. 
<span>239.7 </span>÷<span> 266.68 = 0.898 </span>×<span> 100 = 90% Br.</span>
Sholpan [36]3 years ago
6 0

Answer: The correct answer is option(4).

Explanation:

Molar mass of the aluminium bromide, AlBr_3=266.69 g/mol

Atomic mass of bromine = 79.90 g/mol

Percentage of Mass of bromine in AlBr_3:

\% Br\text{ by mass}=\frac{\text{Atomic mass of Br}\times \text{Number of Br atoms}\times 100}{\text{Molar mass of }AlBr_3}

\% Br\text{ by mass}=\frac{79.90 g/mol\times 3\times 100}{266.69 g/mol}=89.97\%\approx 90\%

Hence, the correct answer is option(4).

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