CHEM 1050 Lecture Notes - Sodium Bromide, Magic 2Ch, Acetaldehyde
2 Oct 2013
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A chemical equation may look like the following: ch4 + 2o2 co2 + 2h2o. Ch4(g) + 2o2(g) co2(g) + 2h2o(l), h = 890kj. States are ____________ specified: (s) solid, (l) liquid, (g) gas, (aq) aqueous. H values (usually kj mol-1) are signed (+/ ). This thermochemical equation tells us that when 1 mole of methane is burned completely in air to give co2 gas and liquid water, 890 kj of energy is given off. A typical endothermic reaction: caco3(s) cao(s) + co2(g), h = +178 kj i. e. , we must supply 178 kj of energy to convert 1 mole caco3(s) to cao(s) and co2(g). Thermochemical equations normally tell you about energy changes associated with _______________ of something. e. g. , we saw above that the h for combustion of 1 mole ch4 at 298 k was 890 kj. When a thermochemical equation is multiplied by any factor, the value of h is ____________________________.
