A piece of iron (mass = 25.0 g) at 398 K is placed in a styrofoam coffee cup containing 25.0 mL of water at 298 K. Assuming that no heat is lost to the cup or the surroundings, what will the final temperature of the water be? The specific heat capacity of iron = 0.449 J/g°C and water = 4.18 J/g°C.

This is the final temperature of water = 398 K

Explanation:

Mass of iron = 25 gm

Initial temperature of iron = 398 K

Mass of coffee cup = 25 ml = 25 gm

Temperature of coffee cup  = 298 K

Specific heat of iron = 0.449

Specific heat of water = 4.18

From the energy balance principal,

Heat lost by the iron = heat gain by the coffee cup

⇒ ×  × = × ×

⇒ 25 × 0.449 × = 25 × 4.18 ×  

⇒ 0.449 × =  4.18 ×  

⇒ 398 - = 9.3  ( - 398 )

⇒ = 9.3 - 3701.4

⇒ 10.3 = 4099.4

⇒ = 398 K

This is the final temperature of water.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

the answer is c

tell me if wrong