Compare the quantityof heat produced by the combustion of 1.0 g glucose (C_(6)H_(12)O_(6)) with that producedby 1.0 gsucrose(C_(12)H_(22)O_(11)). Given that the standard heats of formation ofCO_(2), H_(2)O , glucose ans sucrose are -393.5, -285.9 , -1260 and -2221 kJ mol^(-1) respectively.

Compare the quantityof heat produced by the combustion of 1.0 g glucos

1.	Compare the quantityof heat produced by the combustion of 1.0 g glucose (C_(6)H_(12)O_(6)) with that producedby 1.0 gsucrose(C_(12)H_(22)O_(11)). Given that the standard heats of formation ofCO_(2), H_(2)O , glucose ans sucrose are -393.5, -285.9 , -1260 and -2221 kJ mol^(-1) respectively.
Answer» Solution :`C_(6)H_(12)O_(6)+ 6O_(2)RARR 6CO_(2)+6H_(2)O` `Delta_(r) H^(@) = [ 6 Delta_(r)H^(@) (CO_(2))+6Delta_(r) H^(@)( H_(2)O) ] = [ Delta_(r)H^(@) ( C_(6) H_(12)O_(6))+ 6 Delta_(f) H^(@) (O_(2))]` `= [6( - 393.5) + 6( -285.9)]-[(- 1260)+ 6(0)] = - 2816kJ mol^(-1)` `:. `Heat produced from 1G glucose `= ( 2816.4)/( 180) =15.6 kJ ` `C_(12) H_(22)O_(11)+ 12O_(2) rarr 12CO_(2) + 11H_(2)O` `Delta_(r)H^(@) =[ 12 ( - 393.5) +11( - 285.9) ] - [ -2221+0]= -5645.9 kJ mol^(-1)` `:.` Heat produced from 1 g sucrose ` =( 5645.9 ) /(342) kJ = 16.5 kJ `