Consider the following reaction: How much energy would be released in the formation of 21.3 g of H20? (Note that the 15,026kJ is a product here)

2 C12H26(1) +
37 O2(g) —->
24 CO2(g) + 26 H2O) + 15,026 kJ

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cutt.ly/tz3yDpb

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the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.