For all problems, show calculations to receive credit (1 pt each) 1 How is the l
ID: 706634 • Letter: F
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For all problems, show calculations to receive credit (1 pt each) 1 How is the limiting reagent in a chemical reaction determined? If necessary go online and look up resource gven in the introduction) What is the limiting reagent in Sec A? We 2 If the density of the final solution is 1.02 g/ml, what would be the value of m in grams if the volume 3 if C,-4.04 J gec for a 1 M solution of NaCl and the AT was 10 °C, using the mass calculated above, what would be the value of heat of reaction (@) in kJ. (Show unit conversiono 4 How many moles are in 50 mL of a 2M solution? (Show unit conversion) 5 if the stated heat of a reaction AH, is 57 kJ but only 0.005 moles of a substance was used in the experiment, what is the expected heat of the reaction (q)? (Show unit conversion) 6 If the heat of the reaction is known, heat capacity for the calorimeter (Ca) in section A can be calculated by using as an algebraic restatement of the heat equation (see lab introduction). Calculate the heat capacity for a calonmeter, if the heat of the reaction ?? is 58.3 kJ mol, the number of moles 0.1 mol, and the mass of the reaction is 100 g. C, is 3.8J°g and change in temperature was 10 C. Show equation and work (Hint: See Introduction to lab) 7 Explain how to make a 2M NaOH solution 81f the specific heat of a substance (Cs) is .08 kJ ?1g"and the mass of the reaction is 100 g, what is the heat capacity of the reaction (C) in KJ/ C ? Show unit conversions 9 Heat capacities can be added together to obtain the total heat capacity and then multiplied by AT to obtain the heat (q) of the reaction. If heat capacity of the calorimeter is 0.38kJ/ °C and the heat capacity of the reaction is 0.52 kJ/ °C and the change in temperature is 10 °C, what is the heat of the reaction q. 10lfthe total heat of a reaction(q) is 15k, what is the ???f the number of moles is 0.17 Show unit conversion. (See section B of the introduction for q to ?H conversion)Explanation / Answer
1) To determine which is the limiting reagent in a reaction, two factors must be taken into account, the stoichiometric coefficient of the substance and the amount available for its reaction. A limiting reagent is one that is completely consumed in the reaction.
2) D = m / v clearing mass we have: m = D * V = 1.02 g / ml * 100 ml = 102 g 3) The enthalpy change is expressed as: ?Hs = m * Cs * ?T = 102 gr * 4.04 J / g * ºC * 10 ºC = 4120.8 J * (1 KJ / 1000 J) = 4.12 KJ 4) Solution: 2 M = 2 mol / L 50 mL * (1 L / 1000 mL) = 0.05 L 2 mol / L * 0.05 L = 0.1 mol 5) If ?Hr = 57 KJ / mol * 0.005 mol = 0.285 KJ * (1000 J / 1 kJ) = 285 J 6) DATA MISSING 7) We assume that we are going to prepare 1 Liter of NaOH solution at 2M. We take a beaker with a capacity of 1 Liter, add 80 g (2 moles) of NaOH and approximately 200 ml of water, shake until dissolving and intercalated water is added to complete the gauging line. 8) CT = m * Cs = 100 gr * 0.08 KJ / ºC * gr = 8 KJ. 9) Total Capacity = Calorimeter Capacity + Reaction Capacity = 0.38 + 0.52 = 0.9 KJ / ºC Total heat = CT * ?T = 0.9 KJ / ºC * 10 ºC = 9 KJ 10) LACK OF INFORMATION
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