Answer:
666.93 kJ
Step-by-step explanation:
Using the formula;
Q = m × c × ∆T
Where;
Q = amount of heat absorbed (Joules)
m = mass of substance (g)
c = specific heat capacity (4.184 J/g°C)
∆T = change in temperature (°C)
Based on the information provided in the question;
Q = ?
m = 2000g
∆T = 99.7 °C - 20 °C = 79.7 °C
c = 4.184 J/g°C
Using Q = m × c × ∆T
Q = 2000 × 4.184 × 79.7
Q = 666929.6 Joules
To calculate the amount of heat absorbed (Q) in kilojoules (kJ), we say;
1 joule = 0.001 kilojoule
666929.6 Joules = 666929.6 × 0.001
= 666.9296 KJ
Approximately, Q = 666.93 kJ.