1.

Enthalpy of combustion of C to CO_2 is -393.5 KJ mol^-1. Calcualte the heat released upon formation of 35.2 g of CO_2 from carbon and exygen gas.

Answer»

Solution :`C(s)+O_2(G)rarrCO_2(g) DeltaH=-393.5 KJ MOL^--` Heat released in the formation of 1 mol of `CO_2`=393.5 KJ `THEREFORE` Heat released in the formation of 35.2 g `CO_2`=`393.5/44xx35.2=314.8 kJ`
`DeltaH` for the formaiton of 35.2g `CO_2=-314.8kJ`


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