00:01
To calculate delta s of the surroundings, we need to take the negative of delta h of the system, or the reaction, and divide it by the kelvin temperature.
00:17
So the system, or reaction, is 2h2s gas reacting with 3o2 gas to produce 2h2o gas and 2so2 gas.
00:38
So to calculate delta h standard, we simply take two times the delta h of formation of gaseous water, which was not provided, but we can look it up in a table of thermodynamic values.
00:54
And in the table i have the delta h of formation of gaseous water is negative 242 kilojoules per mole.
01:09
We then add to that two times the delta h of formation of the second product, so2, and in the table i have the delta h of formation of so2 is negative 297 kilojoules per mole.
01:32
And now we subtract off the delta h's of formation of the reactants, so it'll be two times the delta h of formation of h2s gas, which in the table i have is negative 21 kilojoules per mole...