Page 172 - Chemistry eBook
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Sample Non-Regents Questions
How many joules are needed to melt 10 grams of water?
3340 joules
Explanation:
Answer
1. Since the question asks how many joules are needed to melt something, we know that we need the heat of fusion value. (Hf = 334 J)
2. Since we need to figure out the heat of fusion for 10 grams, we need the equation that includes mass .
3. Let’s plug the values into the equation: heat = 10 grams (mass)× 334 (Hf)
4. Calculate: q = 10 × 334 = 3340 joules
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