Answer:
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.