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Calculate ΔH° for each reaction.
a. HO• + CH4 → •CH3 + H2O
b. CH3OH + HBr → CH3Br + H2O
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- 21. CH3CH=CH2 – CH3CH2CH3 What reactants (and catalysts) are needed to make the reaction above occur? a. heat, pressure Ob. HCI с. Н20, Н2SO4 Od. H2, PtChoose the correct product for each reaction. A. B. C. D. PPh3 H PPh3 || I ။Alkyl bromide C 1. diethyl malonate NaOEt, EtOH 2. NaOH, H2O 3. H3O*, heat Incorrect
- 2) Complete the reaction: NO. LOH FeCLAcetylsalicylic acid (aspirin) can be synthesized by combining salicylic acid and acetic acid through a condensation reaction. The −OH−OH group from phenol on the salicylic acid condenses with the carboxylic acid group of acetic acid forming acetylsalicylic acid. Draw the structure of acetylsalicylic acid.C. H₂ Pd catalyst ?
- 85. Propane, C3H8, is a hydrocarbon that is commonly used as a fuel. (a) Write a balanced equation for the complete combustion of propane gas. (b) Calculate the volume of air at 25 °C and 1.00 atmosphere that is needed to completely combust 25.0 grams of propane. Assume that air is 21.0 percent O2 by volume. (Hint: We will see how to do this calculation in a later chapter on gases—for now use the information that 1.00 L of air at 25 °C and 1.00 atm contains 0.275 g of O2 per liter.) (c) The heat of combustion of propane is −2,219.2 kJ/mol. Calculate the heat of formation, ΔH∘fΔHf° of propane given that ΔH∘fΔHf° of H2O(l) = −285.8 kJ/mol and ΔH∘fΔHf° of CO2(g) = −393.5 kJ/mol. (d) Assuming that all of the heat released in burning 25.0 grams of propane is transferred to 4.00 kilograms of water, calculate the increase in temperature of the water.For each of the following processes predict the sign of AS for the reaction. In other words, will AS sys be positive (an increase in entropy) or negative (a decrease in entropy)? AS sys is expected to be positive (an increase in entropy) because one molecule is converted into two molecules. AS sys is expected to be negative (a decrease in entropy) because a cyclic compound is converted into acyclic compounds. O AS sys is expected to be positive (an increase in entropy) because an acyclic compound is converted into cyclic compounds. O AS sys is expected to be negative (a decrease in entropy) because two molecules are converted into one molecule.19. Choose the correct reagents/reactants to synthesize the following compound. 1. NaH 1. NaH A. OH 2. OH 2. Br Br 3. H3O* С. 1. NaH 1. NaH HO 2. HO 2. Br Br 3. H;0* B. D.
- Starting from the following alkyne, which products will be obtained upon the action by the following reagents? Match the letter for the product, if found in the list, to each reagent. I A E Br Br reagent BO F Br J Br Br K с G Br Br Br D H L Br Br BrWhat is the product? O 1. Br2/AcOH 2. H₂N.Chemists use many arrow types to communicate different meanings. Align each arrow type with its purpose. C D Two electron movement 1. A Retrosynthesis 2. B One electron movement 3. С Reaction in equilibrium 4. D 5. Е Irreversible reaction 6. F Resonance >