Question detail
In a reaction, 200 g of sodium bicarbonate (NaHCO3) decomposes endothermically, absorbing 2.4 kJ of energy. Calculate the amount of energy absorbed per gram of sodium bicarbonate.
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At a glance
Question
Type
exam_style
Style
Topic
Exothermic and endothermic reactions
Question
In a reaction, 200 g of sodium bicarbonate (NaHCO3) decomposes endothermically, absorbing 2.4 kJ of energy. Calculate the amount of energy absorbed per gram of sodium bicarbonate.
Answer
12.0 kJ/g.
Explanation
The correct option is endothermic reaction: correct Unit 4.5 answer for Energy transfer during exothermic and endothermic reactions. It directly supports the approved learning objective to define an endothermic reaction as one that takes in energy from the surroundings. This keeps the answer anchored to Energy transfer during exothermic and endothermic reactions within Exothermic and endothermic reactions, and avoids mixing energy transfer, reaction profiles, activation energy, chemical cells, fuel cells, exothermic reactions and endothermic reactions unless the objective names them.
Common mistake
Misidentifying the source of energy
Students often think an endothermic reaction takes energy from the reactants rather than from the surroundings
Clarify that in an endothermic reaction the reactants absorb energy that comes from the surroundings, so the surroundings lose energy and cool down
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