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Example Questions
Example Question #1 : Thermochemistry
What amount of heat must be added to a 20-gram sample of ice in order to raise the temperature from to
?
Possible Answers:
Correct answer:
Explanation:
This question requires three steps:
1. We need to raise the temperature of the ice from to
degrees Celsius.
2. We need to melt the ice.
3. We need to raise the temperature of the water from to
degrees Celsius.
Steps one and three can use the equation:
Step 2 requires the enthalpy of fusion to be multiplied by the mass of the water sample.
Finding these three added heats will give us the total amount of heat needed to raise the temperature from to
.
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