Answer:
The final temperature of the water is 36,93°C
Explanation:
When iron comes into contact with water, it gives it heat to increase its temperature. The heat that the iron yields to match the water temperature is.
Q = m . C . ΔT
Q = 25 g . 0,4990 J/g°C (298K - 398K)
Q = 25 g . 0,4990 J/g°C - 100°C = -1247,5 J
Kelvin or Celsius is the same, because ultimately the formula only takes the result of a subtraction
This is the heat (-1247,5 J) that water wins to increase its temperature. As in iron it is a detached heat, the result was negative, however, for water it is a gained heat, that's why it is positive.
1247,5 J = 25g . 4,180 J/g°C (Tfinal - 25°C)
For units, it's more confortable to work in Celsius.
1247,5 J / (25g . 4,180 J/g°C) = Tfinal - 25°C
11,93°C = Tfinal - 25°C
11,93°C + 25°C = Tfinal = 36,93 °C
It is reasonable that the water has increased its temperature because the iron temperature was 100 degrees higher, before both substances came into contact
