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Bad White [126]
2 years ago
15

For the reaction C(s)+H2O(g)→CO2(g)+H2(g) ΔH∘=131.3kJ/mol and ΔS∘=127.6J/K⋅mol at 298K. At temperatures greater than ________ ∘C

this reaction is spontaneous under standard conditions.
Chemistry
1 answer:
Solnce55 [7]2 years ago
8 0

Answer : At temperatures greater than 755.9^oC this reaction is spontaneous under standard conditions.

Explanation : Given,

\Delta H = 131.3 KJ/mole = 131300 J/mole

\Delta S = 127.6 J/mole.K

Gibbs–Helmholtz equation is :

\Delta G=\Delta H-T\Delta S

As per question the reaction is spontaneous that means the value of \Delta G is negative or we can say that the value of \Delta G is less than zero.

\Delta G

The above expression will be:

0>\Delta H-T\Delta S

T\Delta S>\Delta H

T>\frac{\Delta H}{\Delta S}

Now put all the given values in this expression, we get :

T>\frac{131300J/mole}{127.6J/mole.K}

T>1028.99K

T>755.9^oC

Therefore, at temperatures greater than 755.9^oC this reaction is spontaneous under standard conditions.

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A block of aluminum weighing 140 g is cooled from 98.4°C to 62.2°C with the release of 1080 joules of heat. From this data, calc
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<u>Answer:</u>

Specific heat of a substance is the value that describe how the added heat energy of substance has the impact on its temperature.

Unit is <em>(\frac {J}{Kg.K})</em>

<em>C = Q/m. ∆T</em>

<em>C – Specific heat (\frac {J}{Kg.K})</em>

<em>Q- heat energy (J)</em>

<em>M – Mass (Kg)</em>

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<em>M= 140 g = 0.14 Kg</em>

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Substituting  the given data in Equation

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Answer:

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Explanation:

This is a problem of dilution using the equation:

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The initial volume to be taken is not known yet.

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Now, let's substitute these parameters into the the equation above.

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