Homework Answers
Answer:-
This question is solved by using the simple concept of calorimetry which involves heat lost is equal to the heat gained.
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26. Dissolving solid NaOH in water is an exothermic process. We can think of this process...
The change in enthalpy for dissolving ammonium nitrate in water is 26 kJ/mol. Determine the amount...
The change in enthalpy for dissolving ammonium nitrate in water is 26 kJ/mol. Determine the amount of ammonium nitrate (in grams) that was dissolved in water to make 50.0 mL of solution if the temperature of a coffee cup calorimeter changes from 25.3°C to 21.5°C. Assume the density of the solution is 1.0 g/mL and the heat capacity of the solution is 4.2 J/g°C.
You should use care when dissolving H_2SO_4 in water because the process is highly exothermic. To...
You should use care when dissolving H_2SO_4 in water because the process is highly exothermic. To measure the enthalpy change, 4.5 g of concentrated H_2SO_4 (l) was added (with stirring) to 148 g of water in a coffee-cup calorimeter. This resulted in an increase in temperature from 20.8 degree C to 27.7 degree C. Calculate the enthalpy change for the process H_2SO_4 (l) rightarrow H_2SO_4(aq), in kJ/mol. Assume the specific heat capacity of the solution is 4.2 J/g K. Enthalpy...
When 50.08 g of 1.00 M NaOH at 23 C is added to 50.22 g of...
When 50.08 g of 1.00 M NaOH at 23 C is added to 50.22 g of 1.00 M HCl at 23 C, the resulting temperature of the mixture is 29.7 C. (Assume that the calorimeter constant is equal to zero. Assume that the solutions have the same specific heat capacity (4.184 J/g·K) and density (1.00 g/mL) as water. Take care with signs.) a) What is ΔT for this process? b) Calculate qsolution (in J) for this process. c) Calculate qreaction...
Question 26 of 100 66. The dissolving of sodium acetate (NaC.H.O. = 82.04 g/mol) in water...
Question 26 of 100 66. The dissolving of sodium acetate (NaC.H.O. = 82.04 g/mol) in water can be described by the following: NaC.H.O.(s) NaC:H,02(s) NaC.H.O.(aq) AH = 17.2 kj Hoqw much heat will be released when 125 g of sodium acetate dissolve in water? A) 26.2 kj B) 2150 kj C) 7.26 kj D) 11.3 kj o SP Question 28 of 100 81. A chemist prepares an aqueous solution of sodium hydroxide. The solution contains 120.0 g of NaOH and...
1.05 g of NaOH pellet is added to 45 mL of distilled water and the temperature...
1.05 g of NaOH pellet is added to 45 mL of distilled water and the temperature rises from 25.1 oC to 35.8 oC. Determine the heat per mole of NaOH generated in this process. Assume that the density of water is 1 g/mL and the specific heat capacity of the solution is 4.184 J/goC
Part A: When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be de...
Part A: When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 2.79 g of NH4Cl(s) are dissolved in 106.00 g of water, the temperature of the solution drops from 23.17 to 21.34 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be...
A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of...
A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HCl in a calorimeter. Both solutions were initially at 35.00°C and the final temperature of the resulting solution was recorded as 37.00°C. Write a balanced chemical reaction for the neutralization reaction between aqueous NaOH and HCl, determine the number of moles of water formed in this reaction, and calculate the overall heat change of the solution. Assume 1) that no heat is...
The reaction of an acid such as HCl with a base, such as NaOH, in water...
The reaction of an acid such as HCl with a base, such as NaOH, in water is an exothermic reaction. HCl(aq) + NaOH(aq) ---> NaCl(aq) + H2O In one experiment, a student placed 55.0 mL of 1.00 M HCl in a coffee-cup calorimeter and carefully measured its temperature to be 35.5oC. To this was added 55.0 mL of 1.00 M NaOH solution whose temperature was also 35.5oC. The mixture was quickly stirred, and the student noticed that the temperature of...
Enthalpy of Neutralization Reaction: A 25.0 mL sample of 0.200 M NaOH is mixed with a...
Enthalpy of Neutralization Reaction: A 25.0 mL sample of 0.200 M NaOH is mixed with a 25.0 mL sample of 0.200 M HNO3 in a coffee cup calorimeter. NaOH and HNO3 will undergo Neutralization Reaction according to the following balanced equation: NaOH(aq) + HNO3(aq) --> NaCl (aq) + H2O (l) Both solutions were initially at 35.00°C and Tmax of the resulting solution was recorded as 37.00°C (from the graph). Assume 1) that no heat is lost to the calorimeter or the surroundings, and...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If 3.70 mol NaOH and 2.00 mol CO2 are allowed to react, how many moles of the excess reactant remains? 0.15 mol CO2 O 0.30 mol NaOH O 1.70 NaOH 1.00 mol CO2 How much energy is required to change the temperature of 1.50 L of water from 25.0 °C to 100.0 °C? The specific heat capacity of water is 4.184 J/g.°C; density H2O =...
You should use care when dissolving H_2SO_4 in water because the process is highly exothermic. To measure the enthalpy change, 4.5 g of concentrated H_2SO_4 (l) was added (with stirring) to 148 g of water in a coffee-cup calorimeter. This resulted in an increase in temperature from 20.8 degree C to 27.7 degree C. Calculate the enthalpy change for the process H_2SO_4 (l) rightarrow H_2SO_4(aq), in kJ/mol. Assume the specific heat capacity of the solution is 4.2 J/g K. Enthalpy...
Question 26 of 100 66. The dissolving of sodium acetate (NaC.H.O. = 82.04 g/mol) in water can be described by the following: NaC.H.O.(s) NaC:H,02(s) NaC.H.O.(aq) AH = 17.2 kj Hoqw much heat will be released when 125 g of sodium acetate dissolve in water? A) 26.2 kj B) 2150 kj C) 7.26 kj D) 11.3 kj o SP Question 28 of 100 81. A chemist prepares an aqueous solution of sodium hydroxide. The solution contains 120.0 g of NaOH and...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If 3.70 mol NaOH and 2.00 mol CO2 are allowed to react, how many moles of the excess reactant remains? 0.15 mol CO2 O 0.30 mol NaOH O 1.70 NaOH 1.00 mol CO2 How much energy is required to change the temperature of 1.50 L of water from 25.0 °C to 100.0 °C? The specific heat capacity of water is 4.184 J/g.°C; density H2O =...
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