Q.10. Suppose 20.0 mL of 1.0 M H2SO4 (aq) is added to 25.0 mL of 1.0 M NaOH (aq)
ID: 855048 • Letter: Q
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Q.10. Suppose 20.0 mL of 1.0 M H2SO4 (aq) is added to 25.0 mL of 1.0 M NaOH (aq) n 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 n order to calculate qn.) b. Why s AT for these conditions NOT the same as for your acid-base reaction n 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 f1 .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 exothermicExplanation / Answer
1A)
As a note, the symbols after the parentheses indicate the physical state of the substance we are regardiing.
aq = aqeous solution
l = liquid
1. The molecular equation is as follows:
HCl (aq) + NaOH (aq) --> H2O (l) + NaCl (aq)
2. The complete ionic equation (the one you're looking for) consists of all soluble solutes completely dissolved in solution and is as follows:
H+ (aq) + Cl- (aq) + Na+ (aq) + OH- (aq) --> H2O (l) + Na+ (aq) + Cl- (aq)
3. The net ionic equation is the same as the total, or complete, ionic equation except that the spectator ions are left out. Spectator ions are those that appear on both the product side and the reactant side.
H+ (aq) + OH- (aq) --> H2O (l)
Also note that this is also an acid-base reaction.
the reaction between hydrochloric acid and sodium hydroxide the sodium and chloride ions, Na+ and Cl- take no part in the reaction. The reaction is consistent with the Br
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