The Delta_(i)H_1) andDelta_(i) H_(2) of Mg(g ) are740and 1450 kJ mol^(-1). Calculatethe percentageof Mg^(+) ( g) andMg^(2+) ( g) if 1 g ofMg ( g)absorbs 50kj of energy .

The Delta_(i)H_1) andDelta_(i) H_(2) of Mg(g ) are740and 1450 kJ mol^(

1.	The Delta_(i)H_1) andDelta_(i) H_(2) of Mg(g ) are740and 1450 kJ mol^(-1). Calculatethe percentageof Mg^(+) ( g) andMg^(2+) ( g) if 1 g ofMg ( g)absorbs 50kj of energy .
Answer» Solution :No . Of moes of Mgvapourspresent in1 g =`1//24 = 0.0417` Energy absorbed inthe ionizationof 0.0417mole ofMg ( g) to `MG^(2+) ( g) =0.0417xx 740= 30. 83 KJ` Energyleftunused= 50- 30. 83= 19 . 17kj Now 19. 17 kjwill be usedto ionize `Mg^(+)( g) ` to `Mg^(2+)` ( g) `:. ` No. of moles of `Mg^(+)(g )`convertedinto `Mg^(2+) ( g) = 19. 17 // 1450= 0.0132` No. ofmoles ofmagnesium ionsleft as `Mg^(+) ( g) =0.0417-0.0417-0.0132= 0.0285` `:. ` %ageof `Mg^(+) (g)= (0.0285// 0.0417 ) xx 100 =68.35 %` and% ageof `Mg^(2+) ( g) =100-68 . 35 = 31 .65 %`