When 6 moles of CO2(g) react with H2O(I) to form C6H12O6 and O2(g) according to

Question

When 6 moles of CO2(g) react with H2O(I) to form C6H12O6 and O2(g) according to the following equation 2.80E3J kJ of energy are absorbed 6CO2(g) + 6H2O(I) rightarrow C6H12O6 + 6O2(g) Is this reaction endothermic or exothermic? What is the value of q? kJ What is the energy change when the temperature of 14.3 grams of solid diamond in decreased from 36.5 degree C to 22.7 degree C? Answer: Joules. What is the energy change when the temperature of 13.4 grams of solid platinum is decreased from 39.5 degree C to 23.7 degree C? Answer: Joules. A sample of solid platinum is heated with an electrical coil. If 28.2 Joules of energy are added to a 13.4 gram sample and the final temperature in 39.5 degree C, what is the initial temperature of the platinum? Answer: degree C. A sample of solid gold is heated with an electrical coil. If 28.9 Joules of energy are added to a 12.1 gram sample and the final temperature is 38.5 degree C, what is the initial temperature of the gold? Answer degree C.

Explanation / Answer

1-hexene + Br2 --> 1,2-dibromohexane

1,2-dibromohexane + strong base (I recommend lithium diisopropylamine, Li-N-iPr2, abbreviated LDA) --> 1-bromo-1-hexene + another equivalent of LDA --> 1-hexyne. This is a double dehydrohalogenation reaction to form an alkene from a vicinal dibromide.

Strong bases (e.g. LDA, NaH) will deprotonate a terminal alkyne. This anion can be alkylated with ethyl iodide.
1-hexyne + LDA + EtBr --> 3-octyne.

Alkynes can be reduced to the cis-alkene with Lindlar's catalyst, which is Pd/C treated with inactivating "poisons" such as quinoline and barium sulfate.
3-octyne + H2 + Lindlar's catalyst --> cis-3-octene.

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