Answer to Question #308907 in Math for Kendall

Question

First Law of Thermodynamics and Calorimetry (5 points each)

A gas system with constant pressure has change in internal energy of 240 J. Heat was lost to the surroundings and 150 J work was done to the surroundings as well. How many calories of heat was lost?

315 moles of butane (C4H10) was burned in a copper calorimeter containing 5065 g of water. The calorimeter weighs 2,800 g. The temperature was observed to increased by 3.15 °C. Calculate the molar heat of combustion of butane. The specific heat of copper and water are 0.386 J/g. °C and 4.18 J/g. °C respectively.

A 60-g silver spoon (specific heat 0.233 J/g °C) at 25 °C is placed in 180 g of coffee at 85 °C and the temperature of the two become equal. What is the final temperature when the two become equal? The coffee has specific heat of 5.12J/g. °C.