00:01
Hello everyone in this question they have given enthalpy of formation of water that is hf of water how much it is that is minus 285.
00:12
0 .83 kilojoule per mole and also they have given enthalpy of formation of carbon dioxide they have given that is minus 393 minus 393.
00:29
93 .51 kilojoule per mole and enthalpy of reaction they have given.
00:36
The enthalpy of reaction is minus 3186 kilojoules per mole and here they have asked that what is the enthalpy of formation of isothelic acid that is c8 h6o4.
00:52
That one we have to find out.
00:54
Before that we have to write the balanced chemical reaction of isothelic acid, combustion of isothelic acid, that is c8, h6, 04, when it is undergoes combustion, it produced co2 plus water.
01:12
So here 4 mores of co2 and 3 more water is produced and 7 upon 2 more of oxygen is consumed.
01:20
Now we are going to find out enthalpy formation of isosithic acid.
01:24
For that we have an equation, delta h, the enthalpy of reaction is equal to summation of the of enthalpia formation of production of formation of products minus summation of enthalpy of formation of reactants formation of reactants so here enthalpy of reaction how much it is that is they have given minus 3186 kilojoule per mole is equal to summation of enthalpy of formation products here carbon dioxide and water is our product so here 4 into enthalpy formation of carbon dioxide is how much it is that is minus 393 .51 kilojoule per mole plus plus 3 into enthalpy of formation of water that is to minus of 285.
02:24
0 .83 kilojoule per mole minus enthalpy of reaction of reactant here reactant is is is acid that is that one you have to find out enthalpy of formation of is isothelic acid that is c8 h6 .4 this c8 h6 .04 so here enthalpy a formation of oxygen is always zero because it is existing standard state as we know that the enthalpy of formation of our combustion of any compound in its standard state is always zero that is why here enthalpy of formation of oxygen is zero so now we are going to find out enthalpya formation of is isothelic acid that is minus 3186 kilojoule per mole is equal to 4 into minus 393 .51 kilojouper mole is equal to minus 157 minus 1574.
03:29
04 kilojou per mole minus 3 into minus of 287...