Answer:
7.31 x 10⁵ kJ
Step-by-step explanation:
To find the energy gained by the iron sample, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = T₂ - T₁ = change in temperature (°C)
T₂ represents the final temperature and T₁ represents the initial temperature. After you calculate the value of "Q", you need to convert the energy from joules (J) to kilojoules (kJ).
Q = ? J c = 0.387 J/g°C
m = 24.6 g ΔT = 99.8°C - 23.0°C = 76.8°C
Q = mcΔT <----- Equation
Q = (24.6 g)(0.387 J/g°C)(76.8°) <----- Insert values
Q = 731 J <----- Multiply
1,000 J = 1 kJ
731 J 1 kJ
-------------- x ------------------- = 7.31 x 10⁵ kJ
1,000 J