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10 Nov 2019
Q.10. Suppose 20.0 mL of 1.0 M H2SO4 (aq) is added to 25.0 mL of 1.0 M NaOH (aq) Ân an experiment similar to the one you did in Part I of the lab. Assume that both protons from the sulfuric acid are completely dissociated in the H2S04 solution. a. Use the value of triangle H degree (kJ/mol) you determined in Part I to calculate the value of AT you would obtain if you made the measurement described in part (a). (Hint: You will need to determine how many moles of product are formed with the given conditions Ân order to calculate qn.) b. Why Âs AT for these conditions NOT the same as for your acid-base reaction Ân Part A? Q.11. Consider the combustion of methanol (CH3OH). a. Write a balanced reaction for the combustion of methanol. b. The enthalpy of combustion of methanol is -658kJ/mol Calculate the energy (in J) released Âf1 .00 g of methanol is combusted c. What mass of methanol (in g) would need to be combusted to raise the temperature of 100.0 g of water by 10.0 degree C? Assume no heat lose to the surroundings or to the calorimeter? the specific heat of water is 4.184 J/g. degree C. 1A Write the overall and the ionic reaction equations (or NQJI with HCI and describe what is happening in the reaction from a molecular level perspective. 1B) Reaction Endothermic or exothermic 2A) Write a Balanced chemical reaction for the reaction of ethanol with oxygen, and describe what is happening in the reaction from a molecular level perspective. 2B) Reaction Endothermic or exothermic
Q.10. Suppose 20.0 mL of 1.0 M H2SO4 (aq) is added to 25.0 mL of 1.0 M NaOH (aq) Ân an experiment similar to the one you did in Part I of the lab. Assume that both protons from the sulfuric acid are completely dissociated in the H2S04 solution. a. Use the value of triangle H degree (kJ/mol) you determined in Part I to calculate the value of AT you would obtain if you made the measurement described in part (a). (Hint: You will need to determine how many moles of product are formed with the given conditions Ân order to calculate qn.) b. Why Âs AT for these conditions NOT the same as for your acid-base reaction Ân Part A? Q.11. Consider the combustion of methanol (CH3OH). a. Write a balanced reaction for the combustion of methanol. b. The enthalpy of combustion of methanol is -658kJ/mol Calculate the energy (in J) released Âf1 .00 g of methanol is combusted c. What mass of methanol (in g) would need to be combusted to raise the temperature of 100.0 g of water by 10.0 degree C? Assume no heat lose to the surroundings or to the calorimeter? the specific heat of water is 4.184 J/g. degree C. 1A Write the overall and the ionic reaction equations (or NQJI with HCI and describe what is happening in the reaction from a molecular level perspective. 1B) Reaction Endothermic or exothermic 2A) Write a Balanced chemical reaction for the reaction of ethanol with oxygen, and describe what is happening in the reaction from a molecular level perspective. 2B) Reaction Endothermic or exothermic
Collen VonLv2
23 May 2019