Thermochemistry
question 1 of 22
Grade: Form 3
Q: Which letter represents the enthalpy change of reaction?
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Mr of KI = 39+127 = 166. Moles of KI = 16.6/166 = 0.1 mol. From equation, 2 mol KI produces 1 mol PbI₂. So 0.1 mol KI produces 0.05 mol PbI₂. Mr of PbI₂ = 207+254 = 461. Mass = 0.05 × 461 = 23.05g.
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