Homework Answers
Change in temperature is positive in almost all cases of CaCl2, i.e. the final temperature increases in all the cases.
Change in temperature is negative in almost all cases of NH4Cl, i.e. the final temperature decreases in all cases.
Hence, CaCl2 can be used as a hot pack.
And NH4Cl is used as a cold pack.
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5g CaCl2 100.74 10g CaCl2 100.74 15g CaCl2 100.74 5g NH.CI 100.74 5g Mass of water...
The salt ammonium chloride dissolves in water according to the reaction: NH_CI) —NH4+ (aq) + Cl(aq)...
The salt ammonium chloride dissolves in water according to the reaction: NH_CI) —NH4+ (aq) + Cl(aq) (a) Calculate the standard enthalpy change AH° for this reaction, using the following data: AH NHACI() = -314.4 kJ mol-1 AHNH4+(aq) = -132.5 kJ mol-1 AH; Cr(aq) = -167.2 kJ moll kJ (b) Calculate the temperature reached by the solution formed when 36.8 g of NH4Cl is dissolved in 0.186 L of water at 23.7 °C. Approximate the heat capacity of the solution by...
4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a...
4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a coffee- cup calorimeter (at constant pressure), the temperature rose from 25.0°C to 38.7°C. The dissolution process is: CaCiz(s) - Ca2+ (aq) + 2C1-(aq) The heat capacity of the solution and the calorimeter is 1258 J/°C. The molar mass of CaCl2 is 110.98 g/mol. 1) Determine the heat that was absorbed by the solution and calorimeter. (1 point) 2) Determine the heat that was released...
Solve for CaCl2 and find the Error for NH4Cl and CaCl2 Compound Mass of Empty Calorimeter...
Solve for CaCl2 and find the Error for NH4Cl and CaCl2
Compound Mass of Empty Calorimeter & Lid Mass of Empty Calorimeter, Lid and cold water Mass water of Water NH CI 3.5463 CaCl2 542 Mass of vial and used Reagent Used | Mass of Empty Vial Mass of Reagent | 53SZ | 2 4 .97 17.363c 4s.oz? | 24-0 | 23,07.c Initial Temp. of water and Calorimeter Final Temp. of water, reagent, &g 96 C 32. 05 C Calorimeter...
T U IF I question. The salt potassium bromide dissolves in water according to the reaction:...
T U IF I question. The salt potassium bromide dissolves in water according to the reaction: KBr(s) + (aq) + Br"(aq) (a) Calculate the standard enthalpy change AH for this reaction, using the following data: AH?KBr(s) --393.8 kJ mol! AHK (aq) --252.4 kJ mol! AH Br"(aq) --121.6 kJ mol' (b) Calculate the temperature reached by the solution formed when 53.9 g of KBr is dissolved in 0.149 L of water at 22.9 °C. Approximate the heat capacity of the solution...
The salt potassium hydroxide dissolves in water according to the reaction: KOH(s) K+(aq) + OH-(aq) (a)...
The salt potassium hydroxide dissolves in water
according to the reaction:
KOH(s) K+(aq)
+ OH-(aq)
(a) Calculate the standard enthalpy change ΔH° for this reaction,
using the following data:
KOH(s) = -424.8 kJ
mol-1
K+(aq)
= -252.4 kJ mol-1
OH-(aq)
= -230.0 kJ mol-1
kJ
(b) Calculate the temperature reached by the solution formed when
8.05 g of KOH is dissolved in
0.162 L of water at 21.8 °C.
Approximate the heat capacity of the solution by the heat capacity...
A volume of water was heated to 82.86C and immediately added to 50.31 mL of water...
A volume of water was heated to 82.86C and immediately added to 50.31 mL of water at 22:45 °C contained within a coffee cup calorimeter. The final temperature of the mixture was 37,08°C. The final volume of water inside the calorimeter was 94.33 mL. Calculate the following: Note: Heat capacity a. volume of hot water added is 4.18 *Consider sig fig b. masses of hot and cold water (density of water = 1,00 g/mL) c. changes in temperature (AT) of...
The salt copper(II) sulfate dissolves in water according to the reaction: CuSO4(s) ----->Cu2+(aq) + SO42-(aq) (a)...
The salt copper(II) sulfate dissolves in water according to the reaction: CuSO4(s) ----->Cu2+(aq) + SO42-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: CuSO4(s) = -771.4 kJ mol-1 Cu2+(aq) = 64.8 kJ mol-1 SO42-(aq) = -909.3 kJ mol-1 ______kJ (b) Calculate the temperature reached by the solution formed when 18.3 g of CuSO4 is dissolved in 0.195 L of water at 24.2 °C. Approximate the heat capacity of the solution by the heat capacity...
please help When a solid dissolves in water, heat may be evolved or absorbed. The heat...
please help
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 0.85 g of CaCl2(s) are dissolved in 100.10 g of water, the temperature of the solution increases from 24.36 to 25.89 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be...
When 23.6 g of calcium chloride, CaCl2, was dissolved in water in a constant-pressure calorimeter, the...
When 23.6 g of calcium chloride, CaCl2, was dissolved in water in a constant-pressure calorimeter, the temperature rose from 25.0 C to 38.7 C. If the heat capacity of the solution and the calorimeter is 1258 J/C, what is the enthalpy change when 0.710 mol of calcium chloride dissolves in water? The solution process is CaCl2(s) --> Ca2+(aq) + 2Cl–(aq)
Given the following data for each of the salts answer the questions below: KCINH.NO, Literature AH,...
Given the following data for each of the salts answer the questions below: KCINH.NO, Literature AH, kJ/mol 17.33 25.7 Cost salt per 2.5 kg $55.87 $106.70 LICI -37.03 $157.30 CaCl, -81.6 $119.28 Draw the below table and enter your experimental data for Heat of solution/g of salt. Calculate the cost in cents) of 10g of each salt and write in the table below. Name of Salt Heat of solution/g Cost (in cents) of 10 g of salt for of salt...
The salt ammonium chloride dissolves in water according to the reaction: NH_CI) —NH4+ (aq) + Cl(aq) (a) Calculate the standard enthalpy change AH° for this reaction, using the following data: AH NHACI() = -314.4 kJ mol-1 AHNH4+(aq) = -132.5 kJ mol-1 AH; Cr(aq) = -167.2 kJ moll kJ (b) Calculate the temperature reached by the solution formed when 36.8 g of NH4Cl is dissolved in 0.186 L of water at 23.7 °C. Approximate the heat capacity of the solution by...
4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a coffee- cup calorimeter (at constant pressure), the temperature rose from 25.0°C to 38.7°C. The dissolution process is: CaCiz(s) - Ca2+ (aq) + 2C1-(aq) The heat capacity of the solution and the calorimeter is 1258 J/°C. The molar mass of CaCl2 is 110.98 g/mol. 1) Determine the heat that was absorbed by the solution and calorimeter. (1 point) 2) Determine the heat that was released...
Solve for CaCl2 and find the Error for NH4Cl and CaCl2
Compound Mass of Empty Calorimeter & Lid Mass of Empty Calorimeter, Lid and cold water Mass water of Water NH CI 3.5463 CaCl2 542 Mass of vial and used Reagent Used | Mass of Empty Vial Mass of Reagent | 53SZ | 2 4 .97 17.363c 4s.oz? | 24-0 | 23,07.c Initial Temp. of water and Calorimeter Final Temp. of water, reagent, &g 96 C 32. 05 C Calorimeter...
T U IF I question. The salt potassium bromide dissolves in water according to the reaction: KBr(s) + (aq) + Br"(aq) (a) Calculate the standard enthalpy change AH for this reaction, using the following data: AH?KBr(s) --393.8 kJ mol! AHK (aq) --252.4 kJ mol! AH Br"(aq) --121.6 kJ mol' (b) Calculate the temperature reached by the solution formed when 53.9 g of KBr is dissolved in 0.149 L of water at 22.9 °C. Approximate the heat capacity of the solution...
A volume of water was heated to 82.86C and immediately added to 50.31 mL of water at 22:45 °C contained within a coffee cup calorimeter. The final temperature of the mixture was 37,08°C. The final volume of water inside the calorimeter was 94.33 mL. Calculate the following: Note: Heat capacity a. volume of hot water added is 4.18 *Consider sig fig b. masses of hot and cold water (density of water = 1,00 g/mL) c. changes in temperature (AT) of...
please help
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 0.85 g of CaCl2(s) are dissolved in 100.10 g of water, the temperature of the solution increases from 24.36 to 25.89 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be...
Given the following data for each of the salts answer the questions below: KCINH.NO, Literature AH, kJ/mol 17.33 25.7 Cost salt per 2.5 kg $55.87 $106.70 LICI -37.03 $157.30 CaCl, -81.6 $119.28 Draw the below table and enter your experimental data for Heat of solution/g of salt. Calculate the cost in cents) of 10g of each salt and write in the table below. Name of Salt Heat of solution/g Cost (in cents) of 10 g of salt for of salt...
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