Question

An iron block of mass 45.87 kg is heated from 7 c to 218

c. if the specific heat of iron is 450 j-1 kg k-1 then how much energy is required

Answer 1

Given:
m = 45.87 kg, mass of iron block
c = 450 /(kg-K), specific heat
T₁ = 7 C, initial temperature
T₂ = 218 C, final temperature

Energy required is
Q = m*c*(T₂ - T₁)
    = (45.87 kg)*(450 J/(kg-K)(218 - 7 K)
    = 4.3554 x 10⁶ J
    = 4.3554 MJ

Answer: 4.36 MJ (nearest hundredth)