Post-UTME Chemistry 2019 Objective — Question 7
Question 7 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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The enthalpy of combustion of graphite is 394 KJ mol-1. The enthalpy change when 3.6g of graphite is burnt is
- A. 120.1 KJ mol-1
- B. 119.8 Kj mol-1
- C. 118.2 KJ mol-1Correct
- D. 110.3 KJ mol-1
Explanation
Moles of graphite = 3.6/12 = 0.3mol. Enthalpy change = 0.3 x 394 = 118.2 KJ mol-1.
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