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2B(s)+3H2(g)B2H6(g) Given: 1. 2B(s)+23O2(g)B2O3(s)H=1273kJ 2. B2H6(g)+3O2(g)B2O3(s)+3H2O(g)H=2035kJ 3. H2(g)+21O2(g)H2O(I) H=286kJ 4. H2O(l)H2O(g) H=+44kJ

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