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denis23 [38]
4 years ago
5

A plastic cup is filled with 15.5 grams of water. The cup is sealed and placed in the freezer. The water freezes and turns to ic

e. The next day, the ice is taken out of the cup and massed. What is the mass of the ice?
A) 15.0 grams
B) 15.4 grams
C) 15.5 grams
D) 20.5 grams
Chemistry
2 answers:
TiliK225 [7]4 years ago
7 0

The answer is C because it is not going to change

Travka [436]4 years ago
3 0
C.
This is because the water has undergone a physical change meaning that the effects can be reversed. If nothing was added or lost from the water the ice would be the exact same weight.
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Answer : The temperature in kelvins is, T>1108.695K

Explanation : Given,

\Delta H = 178.5 KJ/mole = 178500 J/mole

\Delta S = 161.0 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

The above expression will be:

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T\Delta S>\Delta H

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

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

T>\frac{178500J/mole}{161.0J/mole.K}

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Therefore, the temperature in kelvins is, T>1108.695K

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