A 31.5 g wafer of pure gold initially at 69.4 ∘C is submerged into 63.4 g of water at 27.4 ∘C in an insulated container.

What is the final temperature of both substances at thermal equilibrium?

The final temperature of both substances at thermal equilibrium is 301.0 K

Explanation:

As we know that,  

        .................(1)

where,

q = heat absorbed or released

= mass of gold = 31.5 g

= mass of water = 63.4 g

= final temperature = ?

= temperature of gold =

= temperature of water =

= specific heat of gold =

= specific heat of water=

Now put all the given values in equation (1), we get

The final temperature of both substances at thermal equilibrium is 301.0 K

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.