In which of the following reactions is ΔE closest in value to ΔH?
HNO3(aq) + Na2(CO3)(aq) = NaNO3(aq) + H2O(l) + CO2(g)
KClO3(s) = KCl(s) + (3/2)O2(g)
HCl(aq) + NaOH(aq) = H2O(l) + NaCl(aq)
Na(s) + H2O(l) = NaOH(aq) + (1/2)H2(g)
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dE = q+w so if w is zero dE = q. Which of those reactions produces the least work. Hint: Which reactions have a gas produced; which does not? A gas does work against the atmosphere when expanding.
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