299. Calculate ΔH°298 reactions:

a) 2Li(s)+2H2O(liquid)=2Li+(aq)+2OH-(aq)+H2(g)

b) 2Na(s)+2H2O(liquid)=2Na+(aq)+2OH-(aq)+H2(g)

The standard enthalpies of formation of Li+(aq), Na+(aq) and OH-(aq) are taken to be -278.5, -239.7 and -228.9 kJ/mol, respectively.

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