Question

1-

A Styrofoam cup holds 0.282 kg of water at 25.5°C. Find the final equilibrium temperature (in degrees Celsius) after a 0.123 kg block of iron at 85.1°C is placed in the water. Neglect any thermal energy transfer with the Styrofoam cup. The specific heats of water and iron are c_water = 4186

J

(kg · °C)

and c_Fe = 448

J

(kg · °C)

.

2- A(n) 70-g ice cube at 0°C is placed in 710 g of water at 22°C. What is the final temperature of the mixture?

3- A 53-g ice cube at 0°C is heated until 45.8 g has become water at 100°C and 7.2 g has become steam at 100°C. How much energy was added to accomplish the transformation?

4- How much energy is required to change a 30-g ice cube from ice at −20°C to steam at 115°C?

Answer 1