Acetone Can Be Easily Converted to Isopropyl Alcohol by Addition of Hydrogen
Acetone tin be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond Summate the enthalpy of reaction using the bond energies given: Enter your answer in kilojoules. 0_H Hjc_C_CHl, (4) Hz () Hjc_~C_Cl, (@) Bond: C-O H-HC-Ho-HC-CC-0 Bail energy (kJmol): 745 432 413 467 347 358
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Answer
Acetone, $\mathrm{CH}_{3} \mathrm{COCH}_{3},$ is a liquid solvent. The enthalpy alter at $25^{\circ} \mathrm{C}$ and 1 atm for the consummate called-for of ane mol of acetone in oxygen to give $\mathrm{CO}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(50)$ is $-1791 \mathrm{~kJ}$. From this and from information given in Tabular array half-dozen.ii , calculate the standard enthalpy of formation of acetone.
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Video Transcript
So thermodynamics is the study of the relationship between heat work, temperature and free energy. That'due south what we're taking a look at here is a combustion reaction. And so when nosotros calculate the standard entropy alter delta H non this is equal to the sum of the malls. The standard entropy modify of germination of the products subtracted some of the malls, multiplied past the standard entropy change of germination of our reactant. But interestingly enough, nosotros're non computing the standard and to be changed. And so what nosotros have is the following value for entropy change negative 17 91 kg joules per mole which is equal to iii, multiplied by negative 393.5 kg joules per mole. And what we do is add three multiplied past negative 2 8 5.8 republic of kenya jewels Permal. And then that'southward the get-go office of the equation hither. And now we subtract the second half which is equal to the standard entropy change germination of ch 3 C O C H 3 which is the liquid, Add four lots of goose egg. And so at present what we need to do is simply rearrange to make this component the subject of the equation and then we solve so are start and change standard and we inverse formation for CH 3, COCH 3 is equal to about negative 247 kg joules per mom. So I've rounded upwards to 3 significant figures that if you like, 4 significant figures, I become negative 246.9 kg joules per calendar month
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