• +q → absorbs heat
• –q → loses heat
Heat transfer: hot to cold
heat released by lead = heat absorbed by glass
– qlead = + qglass
At thermal equilibrium:
▪ final temperature of lead = final temperature of glass = final temperature of system
Two substances, lead and glass (Pyrex), initially at different temperatures, come into contact and reach thermal equilibrium. The mass of lead is 18.1 g and its initial temperature is 62.6˚C. The mass of glass (Pyrex) is 20.6 g and its initial temperature is 25.1˚C. What is the final temperature of both substances at thermal equilibrium? (The specific heat capacity of lead is 0.128 J/g•˚C; the specific heat capacity of glass (Pyrex) is 0.75 J/g•˚C.)
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