Homework Answers
P1:
mass of solution
mass of water = 1 g/mL * 50 mL = 50 g
total mass of solution = 4.72+50 = 54.72 g
P2.
Assume that the specific heat of the mix is equal to that of water, i.e. 4,184 J/gK
P3.
Absolute value of chang ein temperature:
Tf-Ti = 28.3-25.0 = 3.3 °C
P4.
Total heat involved
Q = m*C*(Tf-Ti)
Q = 54.72*4.184*3.3 = 755.529 J
5) A 34.44-g sample of an unknown metal, heated to 98.6°C, is transferred to 50.0 mL...
5) A 34.44-g sample of an unknown metal, heated to 98.6°C, is transferred to 50.0 mL of H,O at 22.2°C. The equilibrium temperature is 28.3°C. What is the specific heat of the metal? (specific heat of water is 4.18 J/g °C) a) 0.527 J/g•°C b) 1.054 J/g•°C c) 0.845 J/g °C d) 5.274 J/g•°C
A 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined...
A 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined and a temperature change of 6.61 was observed. The specific heat of water is 4.18 J/(g * ∘C) Calculate the total heat change (in kilojoules) for the calorimeter. Record your answer with the proper significant figures and include the correct sign if needed. Assume the density and specific heat of the solution are the same as that of water.
The molar mass of solid is 110.98 g/mol PART IV MOLAR MASS OF SOLID Mass of...
The molar mass of solid is 110.98 g/mol
PART IV MOLAR MASS OF SOLID Mass of Calorimeter (g) 10%1841 991565p S10005 Mass of Calorimeter plus water (g) Mass of water (g) Mass of unknown solid (g) alig'c 28.3 Initial temperature (°C) Final temperature (C) Temperature change (AT) Heat, q (kJ) Heat of solution per gram of solid (kJ/g) Heat of solution per mole of compound (kJ/mol) DATA ANALYSIS 1. Calculate q solution (Cs for water is 4.184 J/g°C) 2. Identify...
If 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined...
If 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined and a temperature change of 8.03°C was observed, The specific heat of water is 4.18 J/(g * ∘C) Calculate the enthalpy of decomposition of hydrogen peroxide (ΔH) determined from the experimental data. Record your answer with the proper significant figures and include the correct sign if needed. Assume the density and specific heat of the solution are the same as that of water.
Consider the following reaction at 25 degree C: 2HNO_3 (aq) + NO(g) rlhar 3 NO_2(g) +...
Consider the following reaction at 25 degree C: 2HNO_3 (aq) + NO(g) rlhar 3 NO_2(g) + H_2O(l) Calculate Delta G degree rxn using the following information HNO_3 (aq) NO(g) NO_2(g) H_2O(l) Delta H^degree (kJ/mol) -207 91.3 33.2 -285. 8 S^degree (J/mol K) 146 210.8 240.1 70.0 Calculate the value of the equilibrium constant, K, at 25 degree C At 25 degree C does the above reaction favor reactant or product formation? What evidence supports your conclusion? Procedure: Obtain the five...
measurements show that unknown compound X has t A 50.0 mL of 0.88 M H2O2 and...
measurements show that unknown compound X has t
A 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined and a temperature change of 7.57 was observed. The specific heat of water is 4.18 J/g * .C). Calculate the total heat change (in kilojoules) for the calorimeter. Record your answer with the proper significant figures and include the correct sign if needed. Assume the density and specific heat of the solution are the same as...
If 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined...
If 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined and a temperature change of -6.61°C was observed, The specific heat of water is 4.18 J/(g * ∘C) Calculate the heat of reaction (in kilojoules). Record your answer with the proper significant figures and include the correct sign if needed.
You dissolve 3.0 g of CaCl (s) in 140.0 g of water in a constant pressure...
You dissolve 3.0 g of CaCl (s) in 140.0 g of water in a constant pressure calorimeter of negligible heat capacity. The reaction is: CaCl(s) Ca (aq) +2CI (aq) 2. The initial temperature of the water is 22.4 °C and upon dissolution of the compound the temperature of the solution rises to 25.8 °C. (15 points total) What is the heat of this reaction per mole of CaCl; (molar mass 110.98 g/mol), assuming the specific heat of the solution is...
Mass of beaker plus solid Mass of water,mno 1.229 4,298-g 41-949 Mass of solid, m Initial...
Mass of beaker plus solid Mass of water,mno 1.229 4,298-g 41-949 Mass of solid, m Initial temperature Final temperature a1,0 for the reaction (Eq. 1 ) (SH. = 4.18 J/g°C) ΔH for the reaction (Eq.5) The quantity you have just calculated is approximately" equal to the heat of solution of your sample. Calculate OC - joules joules the heat of solution per gram of solid sample. The solution reaction is endothermic exothermic. (Underline the correct answer.) Give your reasoning. Solid...
Fill in the blank with the provided data and show calculations 6.012 31.946 g g Part...
Fill in the blank with the provided data and show
calculations
6.012 31.946 g g Part A: Calorimetry Data mass of calorimeter mass of calorimeter + water mass of water 44.969 34.089 g g 38.957 2.143 g mass of beaker mass of beaker + urea mass of urea molar mass of urea moles of urea g 60 g/n 22.650 0.0357 °C mol 18.720 original temperature final temperature temperature change °C 3.93 °C Part A: Calorimetry Calculations: 640.6 J heat absorbed...
5) A 34.44-g sample of an unknown metal, heated to 98.6°C, is transferred to 50.0 mL of H,O at 22.2°C. The equilibrium temperature is 28.3°C. What is the specific heat of the metal? (specific heat of water is 4.18 J/g °C) a) 0.527 J/g•°C b) 1.054 J/g•°C c) 0.845 J/g °C d) 5.274 J/g•°C
The molar mass of solid is 110.98 g/mol
PART IV MOLAR MASS OF SOLID Mass of Calorimeter (g) 10%1841 991565p S10005 Mass of Calorimeter plus water (g) Mass of water (g) Mass of unknown solid (g) alig'c 28.3 Initial temperature (°C) Final temperature (C) Temperature change (AT) Heat, q (kJ) Heat of solution per gram of solid (kJ/g) Heat of solution per mole of compound (kJ/mol) DATA ANALYSIS 1. Calculate q solution (Cs for water is 4.184 J/g°C) 2. Identify...
Consider the following reaction at 25 degree C: 2HNO_3 (aq) + NO(g) rlhar 3 NO_2(g) + H_2O(l) Calculate Delta G degree rxn using the following information HNO_3 (aq) NO(g) NO_2(g) H_2O(l) Delta H^degree (kJ/mol) -207 91.3 33.2 -285. 8 S^degree (J/mol K) 146 210.8 240.1 70.0 Calculate the value of the equilibrium constant, K, at 25 degree C At 25 degree C does the above reaction favor reactant or product formation? What evidence supports your conclusion? Procedure: Obtain the five...
measurements show that unknown compound X has t
A 50.0 mL of 0.88 M H2O2 and 10.0 mL of 0.50 M Fe(NO3)3 were combined and a temperature change of 7.57 was observed. The specific heat of water is 4.18 J/g * .C). Calculate the total heat change (in kilojoules) for the calorimeter. Record your answer with the proper significant figures and include the correct sign if needed. Assume the density and specific heat of the solution are the same as...
You dissolve 3.0 g of CaCl (s) in 140.0 g of water in a constant pressure calorimeter of negligible heat capacity. The reaction is: CaCl(s) Ca (aq) +2CI (aq) 2. The initial temperature of the water is 22.4 °C and upon dissolution of the compound the temperature of the solution rises to 25.8 °C. (15 points total) What is the heat of this reaction per mole of CaCl; (molar mass 110.98 g/mol), assuming the specific heat of the solution is...
Mass of beaker plus solid Mass of water,mno 1.229 4,298-g 41-949 Mass of solid, m Initial temperature Final temperature a1,0 for the reaction (Eq. 1 ) (SH. = 4.18 J/g°C) ΔH for the reaction (Eq.5) The quantity you have just calculated is approximately" equal to the heat of solution of your sample. Calculate OC - joules joules the heat of solution per gram of solid sample. The solution reaction is endothermic exothermic. (Underline the correct answer.) Give your reasoning. Solid...
Fill in the blank with the provided data and show
calculations
6.012 31.946 g g Part A: Calorimetry Data mass of calorimeter mass of calorimeter + water mass of water 44.969 34.089 g g 38.957 2.143 g mass of beaker mass of beaker + urea mass of urea molar mass of urea moles of urea g 60 g/n 22.650 0.0357 °C mol 18.720 original temperature final temperature temperature change °C 3.93 °C Part A: Calorimetry Calculations: 640.6 J heat absorbed...
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