Reactions involving gold have been of particular interest to a chemist. Consider the following reactions, {:(Au (OH)_(3) + 4 HCl rarr HAuCl_(4) + 3 H_(2) O",",Delta H = - 28 k Cal,),(Au (OH)_(3) + HBr rarr HAuBr_(4) + 3 H_(2)O",",Delta H = -36.8 k Cal,):} In an experiment there was an absorption of 0.44 k Cal when one mole of HAuBr_(4) was mixed with 4 moles of HCl. what is the percentage conversion of HAuBr_(4) into HAuCl_(4) ?

Reactions involving gold have been of particular interest to a chemist

1.	Reactions involving gold have been of particular interest to a chemist. Consider the following reactions, {:(Au (OH)_(3) + 4 HCl rarr HAuCl_(4) + 3 H_(2) O",",Delta H = - 28 k Cal,),(Au (OH)_(3) + HBr rarr HAuBr_(4) + 3 H_(2)O",",Delta H = -36.8 k Cal,):} In an experiment there was an absorption of 0.44 k Cal when one mole of HAuBr_(4) was mixed with 4 moles of HCl. what is the percentage conversion of HAuBr_(4) into HAuCl_(4) ?
Answer» 0.005 0.006 0.05 0.5 Solution :TARGET REACTION `HAuBr_(4)+4HCL rarr HAuCl_(4)+4HBr` `DeltaH=8.8` `%` CONVERSION `=100/8.8 xx0.44=5%`