Experimental work (4) Answers

IB Chemistry: Experimental work (4) Answers

Answers to Experimental work Question 4 (b) Heat evolved by combusting 0.553 g = 4.18 x 0.250 x 10.4 = 10.868 kJ [1]M(C2H5OH) = (2 x 12.01) + (6 x 1.01) + 16.00 = 46.08 g mol-1ΔH = − (46.08 ÷ 0.553) x 10.868 = − 906 kJ mol−1 (minus as exothermic) [1](c) Experimental error = ((1367 – 906) ÷ 1367) x 100 = 33.7% [1](d) Any two from:The water in the beaker needed to be stirred to ensure a uniform temperature throughout.The...


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