If 5000 J of heat is released for 0.02 moles of reactant, what is the energy change per mole?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

If 5000 J of heat is released for 0.02 moles of reactant, what is the energy change per mole?

Explanation:
Energy change per mole is found by dividing the heat transferred by the amount of substance: ΔE per mole = q / n. Since heat is released, q is negative: q = -5000 J, and n = 0.02 mol. So ΔE per mole = (-5000 J) / (0.02 mol) = -2.5 × 10^5 J/mol. This means each mole of reactant would release 2.5 × 10^5 J of energy (the negative sign shows release). The magnitude is 2.5 × 10^5 J/mol (often written as 250 kJ/mol).

Energy change per mole is found by dividing the heat transferred by the amount of substance: ΔE per mole = q / n. Since heat is released, q is negative: q = -5000 J, and n = 0.02 mol. So ΔE per mole = (-5000 J) / (0.02 mol) = -2.5 × 10^5 J/mol.

This means each mole of reactant would release 2.5 × 10^5 J of energy (the negative sign shows release). The magnitude is 2.5 × 10^5 J/mol (often written as 250 kJ/mol).

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