Lesson: Chapter 8 — Heat changes in chemical reactions

Measuring a heat of reaction 3 of 5 Reset answers

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Question 3

100 g of a dilute solution warms by 5 °C. Taking c = 4200 J kg^-1 °C^-1, how much heat was released?

A 2100 J B 21000 J C 4200 J D 420 J

The right answer is the one marked above.

2100 J. Q = 0.1 kg × 4200 × 5 = 2100 J. Forgetting to change 100 g into 0.1 kg gives 2100000 J.

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