Chem 16 Solutions

108. Two putting green sugars, glucose or C6H12O6, and saccharose or C12H22O11, argon both carbohydrate4s. Their standard enthalpies of ecesis are: Glucose = -1273 kJ/ breakwater and sucrose = -2221 kJ/mol. Using this data: a) conduct the molar hydrogen of burn at the stake to carbonic acid gas (g) and H2O (l). b) Calculate the enthalpy of biteion per gee of from each one sugar. C6H12O6 + 6O2 --> 6CO2 + 6H2O (-383.5 x 6 + -285.8 x 6) - (-1273) = -2742.8kJ C12H22O11 + 12O2 --> 12CO2 + 11H2O (-383.5x12 + -285.8x11) - (-2221) = -5524.8kJ -2742.8kJ / 180g/ rampart = -15.24kJ/g -5524.8kJ / 342g/mole = -16.14kJ/g 107. Three common hydrocarbons that contain four carbons are listed here, on wiht their standard enthalpies of formation: Formula Delta H in kJ per mol  1,3-Butadiene C4H6(g) 111.9 1-Butene C4H8(g) 1.2 n-Butane C4H10(g) -124.7 a. For each of these substances, judge the molar enthalpy of combustion to CO2(g) and H2O(l). b. Calculate the kin dle abide by in kJ/g for each of these compounds. c. FOr each hydrocarbon determine the per centum of enthalpy by mass. d. By study your answers for part (b) and (c), give notice a relationship between hydrogen content and fuel value in hydrocarbons. a) for a we early need to buzz off a balanced equation for when the hydrocarbons combust to form CO2 and H20.

Then we plug in the deltaHf value and plug these into the equation. a) C4H6 + 11/2O2 ==> 4CO2 + 3H2O Delta Hrxn = [4DeltaHf(CO2)+3DeltaHf(H2O)] - [DeltaHf(C4H6) + 11/2DeltaHf(O2)] = [4(-393.5kJ) + 3(-285.83kJ)] - [111.9kJ + 11/2(0kJ)] = -2543.39 kJ C4H8 + 6O2 ==> 4CO2 + 4H2O Delta H! rxn = [4DeltaHf(CO2) + 4DeltaHf(H2O)] - [DeltaHf(C4H8) + 6DeltaHf(O2)] = [4(-393.5kJ) + 4(-285.83kJ)] - [1.2kJ +6(0kJ)] = -2718.52kJ C4H10 +13/2O2 ==> 4CO2 +5H2O DeltaHrxn = [4DeltaHf(CO2) + 5DeltaHf(H2O)] - [DeltaHf(C4H10) + 13/2DeltaHf(O2)] = [4(-393.5kJ) + 5(-285.83kJ)] - [-124.7kJ + 13/2(0kJ)] = -2878.45kJ B) for this next question we take the answers from a and divide them by...If you ask to get a full essay, sight it on our website: OrderCustomPaper.com

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