In a vacuum bottle, 320 g of water and 120 g of ice are initially in equilibrium at 0.00∘∘c. the bottle is not a perfect insulator. over time, its contents come to thermal equilibrium with the outside air at 25.0∘∘c. 1) how much does the entropy of universe increase in the process?

Δ

Explanation:

Hello,

To find the change in the entropy of the universe, we must take into account the following entropy balance:

Δ

We can stand the universe as the surroundings so the equals the outside air temperature. Then, we must compute both the water's and ice's released heat due to their interaction with the "hot" air:

Finally, we obtain the change (increasing) in the entropy of the universe as follows:

Δ

Δ

* All the data were extracted from Cengel's thermodynamics book.

Best regards.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.