How much heat (in joules) is needed to raise the temperature of 250 g of water by 40 degrees C? (specific heat 4.2 J/(g C))
Answer and explanation
Correct answer: A. 42000
- Step 1: Q = m c delta T.
- Step 2: Q = 250 x 4.2 x 40 = 42000 J.
Answer
42000.
Why not the others: The specific heat of water must be included, and the temperature change must be multiplied in.
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