1. Suppose that the amount of heat removed when 1.2 kg of water freezes at 0.0 o

Question

1. Suppose that the amount of heat removed when 1.2 kg of water freezes at 0.0 oC were removed from ethyl alcohol at its freezing/melting point of -114.4 oC. How many kilograms of ethyl alcohol would freeze?

2. A thermos contains 154 cm3 of coffee at 90.6 °C. To cool the coffee, you drop two 10.6-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the coffee as if it were water.

3. Water at 19.0 °C is sprayed onto 0.182 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is the minimum mass of water that must be used?

Explanation / Answer

by using

(m(water ) * (Lf)water) / (Lf)alcohol =malcohol

(1.2 * (33.5 * 10^4 )) / ((10.8*10^4 ) ) = malcohol = 3.72kg

so the mass of alcohol is 3.72 kg

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