3 years ago

A substance undergoes a change. Which statement indicates that the change was a chemical change?

Chemistry

1 answer:

romanna [79]3 years ago

5 0

Answer:

Chemical change is represented by change in smell, temp., presence of gaseousness/bubbles, and change in color

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2 years ago

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3 years ago

Based on the equation, how many grams of Br2 are required to react completely with 72.4 grams of AlCl3

svlad2 [7]

Answer: 131 g of bromine is required.

Explanation:

The balanced equation will be :

$2AlCl_3+3Br_2\rightarrow 2AlBr_3+3Cl_2$

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

moles of $AlCl_3$

$\text{Number of moles}=\frac{72.4g}{133g/mol}=0.544moles$

According to stoichiometry :

2 moles of $AlCl_3$ require = 3 moles of $Br_2$

Thus 0.544 moles of $AlCl_3$ require= $\frac{3}{2}\times 0.544=0.816moles$ of $Br_2$

Mass of $Br_2=moles\times {\text {Molar mass}}=0.816moles\times 160g/mol=131g$

Thus 131 g of bromine is required.

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2 years ago