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Introduction to Le Chatelier's Principle

For conversio...

Question

For conversion C (graphite ) $⟶$ C (diamond ) the $Δ S$ is

A

Zero

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B

Positive

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C

Negative

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D

Unknown

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Solution

The correct option is C
Negative

Conversion of graphite into diamond is an endothermic reaction. So, heat of diamond is higher than that of graphite. But $Δ S$ would be negative for the conversion of graphite into diamond

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Similar questions

Q. The enthalpies of combustion of

C_{(g r a p h i t e)}

C_{(d i a m o n d)}

- 393.5

- 395.4 k J / m o l

respectively. The enthalpy of conversion of

C_{(g r a p h i t e)}

C_{(d i a m o n d)}

k J / m o l

Q. Calculate the

Δ H

for conversion of C (diamond) to C (graphite) when the following reactions are given:

C (d i a m o n d) + O_{2} \to C O_{2} (g); Δ H = - 94.5 K c a l

C (g r a p h i t e) + O_{2} \to C O_{2} (g); Δ H = - 94 K c a l

Q. Calculate the enthalpy change accompaning the conversion of

10 g

of graphite into diamond if the heats of combustion of

C (g r a p h i t e)

C (d i a m o n d)

- 94.05 k c a l

- 94.50 k c a l

Q. Assertion :'Diamond are forever' is generally quoted for diamond as a rate of conversion of diamond to graphite at room condition is nearly zero. Reason: At room condition, conversion of diamond into graphite is spontaneous.

Δ H

for the conversion of graphite to diamond.(in kJ/mol)
as nearest integer

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