Chem 101

Heat Calculations

Remember to use significant figures and units.

1. How many calories would be required to change the temperature of 750. grams of water from 15.0 °C to 90.0 °C?

2. How many calories would be required to change the temperature of 250 grams of aluminum from 15 °C to 75 °C? The specific heat of aluminum is .214 cal/g°C.

3. How many calories of heat would be released if the temperature of 300. grams of iron were changed from 75.0 °C to 17.0 °C? The specific heat of iron is 0.107 cal/g°C.

4. How many calories of heat will be released when the temperature of 1000. grams of water drops from 80.0 °C to 35 °C?        .

5. What is the specific heat of gold if 350. calories of heat is released when 15 grams of gold cools from 215 °C to 35 °C?

6. Calculate the mass of water if 3600. calories are released when the temperature is changed from 95 °C to 23 °C.

7. Calculate the heat needed at 0 °C to freeze 35 grams of water.

8. Calculate the heat required to melt 5.0 kilograms of ice.

9. Calculate the kilocalories required to vaporize 44 grams of water.

10. Calculate the joules required to condense 75 grams of steam.