Question

1) Thirty grams of silicon at 80.0°C is added to 70.0 mL of water at 20.0°C. Calculate the final temperature after the two substances are mixed together. The specific heat of water is 4.184 J/g°C and the specific heat of silicon is 0.7121 J/g°C.

2) A cube of brass, 2 cm on a side, is heated until the temperature of the brass is 75^oC. The cube is quickly added to 100 mL of water at 23^oC. What is the final temperature of the mixture? The specific heat of brass is 0.385 J/g^oC. The density of brass is 8.45 g/cm³.