Answer:
(Q1) 9.42 kJ.
(Q2) 1.999 kJ
Explanation:
Heat: This is a form of Energy that brings about the sensation of warmth.
The S.I unit of Heat is Joules (J).
The heat of a body depend on the mass of the body, specific heat capacity, and temperature difference. as shown below
Q = cm(t₂-t₁) ........................ Equation 1
(Q1)
Q = cm(t₂-t₁)
Where Q = amount of heat absorbed, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature, t₂ = final temperature.
Given: m = 229.1 g = 0.2991 kg, t₁ = 25.0 °C, 32.50 °C
Constant: c = 4200 J/kg.°C
Substituting into equation 1
Q = 0.2991×4200(32.5-25)
Q = 1256.22(7.5)
Q = 9421.65 J
Q = 9.42 kJ.
Hence the heat absorbed = 9.42 kJ
(Q2)
Q = cm(t₂-t₁)
Where Q = amount of heat required, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature, t₂ = final temperature.
Given: m = 34 g = 0.034 kg, t₁ = 9 °C, t₂ = 23 °C
Constant: c = 4200 J/kg.°C
Q = 0.034×4200(23-9)
Q = 142.8(14)
Q = 1999.2 J
Q = 1.999 kJ.
Thus the Heat required = 1.999 kJ
