Post-UTME Chemistry 2011 Objective — Question 4
Question 4 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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How much heat will be liberated if 10g of hydrogen burns in excess oxygen according to the thermochemical equation H2(g)+1/2O2(g) -> H2O(l), delta-H=-286KJ
- A. -1430KJCorrect
- B. -2860KJ
- C. -572KJ
- D. -286KJ
Explanation
Moles H2 = 10/2 = 5mol. Heat released = 5 x 286 = 1430KJ (i.e. -1430KJ).
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