1.

For which reaction, (deltaH > deltaU)? ( delta H= change in enthalpy,delta U = change in internal energy)

Answer»

`[Fe(s) + 5 CO(G) rarr Fe(CO)_5(l)]`
`[C(`graphite`)` `+ O_2(g) rarr Co_2(g)]`
`[H_2O(1) rarr H^+(aq) + OH^-(aq)]`
`[CaCO_3(s)rarr CAO(s) + CO_2(g)]`

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