2 years ago

Which option is an example of a chemical change?

1 answer:

6 0

Firework exploding. Thank you :)

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aivan3 [116]

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2 years ago

sveticcg [70]

Answer:

False

Explanation:

It is important to give exact measurements.

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3 years ago

Elza [17]

The answer u are looking for is b

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3 years ago

Vanyuwa [196]

The most appropriate answer is C !!

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3 years ago

shtirl [24]

<u>Answer:</u> The entropy change of the process is $2.0\times 10^2J/K$

<u>Explanation:</u>

To calculate the entropy change for different phase at same temperature, we use the equation:

$\Delta S=n\times \frac{\Delta H_{f}}{T}$

where,

$\Delta S$ = Entropy change

n = moles of acetone = 6.3 moles

$\Delta H_{f}$ = enthalpy of fusion = 5.7 kJ/mol = 5700 J/mol (Conversion factor: 1 kJ = 1000 J)

T = temperature of the system = $-94.7^oC=[273-94.7]=178.3K$

Putting values in above equation, we get:

$\Delta S=\frac{6.3mol\times 5700J/mol}{178.3K}\\\\\Delta S=201.4J/K=2.0\times 10^2J/K$

Hence, the entropy change of the process is $2.0\times 10^2J/K$

4 0

3 years ago