Homework Answers
Q6:
P4 + 6 Cl2
4 PCl3. ∆H = -1280kJ/mol. ------(1)
P4 + 10 Cl2
4 PCl5. ∆H = -1774kJ/mol --------(2)
(Equation 2 - equation 1 )/4
PCl3 + Cl2
PCl5.
∆H = (-1774-(-1280))/4 = -123.5kJ/mol (Answer)
Q7:
Heat absorbed = m.s.∆T = 155g×4.184J/g.℃ × (47.5-18.0)℃
= 19131.34 J
= 19.13 kJ. (Answer)
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- PCI) D ) 10. In cop 0.10-MN 4PCI() AH -1280k 4.ใณใน Assum - 4PCI(s) AH...
#4.(25pts) Consider the reaction AH (kJ/mole) 5 CO2(g) + SizN() ----> 3 SiO(g) + 2 N2O(s)...
#4.(25pts) Consider the reaction AH (kJ/mole) 5 CO2(g) + SizN() ----> 3 SiO(g) + 2 N2O(s) + 5 CO(g) AH = 2023.75 kJ/mole (1) Use the above information as well as heat of formation data in the appendix of your textbook to calculate AH (Si,N.(s)) in kJ/mole. Additional information: AH (SiO(g)) = 1.94 x 109 kJ/mole 6) How many kJ of heat are absorbed when 1.2 lbs of Si N.(s) react according to the above equation? 1 lb = 453.6...
3. For the reaction, P,(s, red) + 10 CL(g) a) AH°(in the units of kcal, kJ,...
3. For the reaction, P,(s, red) + 10 CL(g) a) AH°(in the units of kcal, kJ, and liter-atm) b) AE (in the units of kJ) c) work (w) (in the units of kJ) 4 PCl,(g), calculate: АН, Р =-73.6 kJ mol 4(s,red) AHP PCI,(g) = -398.9 kJ mol 6. For a chemical process 50. kJ of heat energy were released and 20. kJ of work were done by the system. Calculate AE for this process.
GENERAL CHEMISTRY GROUP STUDY SB The first 3 problems are to be submitted today. #1.(30pts, 15...
GENERAL CHEMISTRY GROUP STUDY SB The first 3 problems are to be submitted today. #1.(30pts, 15 pts each) (c) Consider a 135 meter high waterfall. If the decrease in potential energy of the water (i.e., mgh) is totally converted into heat, calculate the temperature difference between the top and bottom of the waterfall. Data: m-mass, g- acceleration due to gravity 9.81 m/s. The specific heat of water- 4.184 J/(g "C). (d) If a system absorbs 30.0 J of heat from...
Experiment 13-Post-Lab Assignment 1. Athletes use cold packs containing ammonium nitrate solutions to ice their injuries....
Experiment 13-Post-Lab Assignment 1. Athletes use cold packs containing ammonium nitrate solutions to ice their injuries. A 1.25 G sample of ammonium nitrate is dissolved in 25.0 mL of water to form a solution. The temperature of the solution falls from 25.8°C to 21.9°C. Find the enthalpy of the reaction (AH ), in kJ/mol. Assume the density of water is 1.00 g/mL and the heat capacity of the total solution to be 4.184 J/g °C 2. Calculate AHⓇ in kJ/mol...
Question 4 of 4 > The enthalpy changes, AH, for three reactions are given. H, ()0,()H,O)...
Question 4 of 4 > The enthalpy changes, AH, for three reactions are given. H, ()0,()H,O) Ca(s) +2H (aq) Ca2 (aq) +H,(g) CaO(s) +2H (aq) - AH=-286 kJ/mol AH= -544 kJ/mol Ca2 (aq) +H,O() AH =-193 kJ/mol Using Hess's law, calculate the heat of formation for CaO(s) using the reaction shown. 0,()Ca) Ca(s) + kJ/mol ΔΗ- TOOLS During an experiment, a student adds 1.81 g CaO to 300.0 mL of 1.000 M HCI. The student observès a temperature increase of...
2. Calculate AH (expressed in kJ/mol) for the following reaction based on the thermochemical information given:...
2. Calculate AH (expressed in kJ/mol) for the following reaction based on the thermochemical information given: Na +Crce → NaCl AH ? Nas) + 2Cl2(g) → Nap + Cle AH = 230 kJ/mol Nag) + Cl → Na(+ Cl® AH = 147 kJ/mol Na(s) + Cl2(e) → NaCl) AH = -411 kJ/mol 3. Consider the reaction: 2HCl) + Ba(OH)2(aq) → BaCl(aq) + 2 H200 AH--118 kJ/mol a. Calculate the heat produced when 700.0 mL of 0.500 M HCl is mixed...
3. When 10 mL of 2.0 M HCl is combined with 30 mL of 0.667 M...
3. When 10 mL of 2.0 M HCl is combined with 30 mL of 0.667 M NAOH a temperature change of 6.9 °C was observed. How much heat was given off per mole of water produced? ASsume the volumes are additive and that this NaCl solution has a density of 1.02 g/mL and a specific heat of 4.00 J/g-C. 2. How much heat is needed to change 32 g of 4.A 0.865 g sample of candy is burned in a...
UL. HAL IVCI U IS DIUROFIN S 2. (15 pts) A 83.5 g sample of a metal alloy is heated to 88.1°C and it is then placed...
UL. HAL IVCI U IS DIUROFIN S 2. (15 pts) A 83.5 g sample of a metal alloy is heated to 88.1°C and it is then placed in a coffee-cup calorimeter containing 30.0 g water at 15.0°C. The final temperature of the metal + water is 25.3 "C. Calculate the specific heat of metal alloy, in J/g °C), assuming no heat escapes to the surroundings or is transferred to the calorimeter. The specific heat of water is 4.184 J/g °C)....
The thermochemical equation for the reaction is shown below: 4 Al(s) + 3 O2(g) → 2...
The thermochemical equation for the reaction is shown below: 4 Al(s) + 3 O2(g) → 2 Al2O3(s) AH = -3352 kJ How much heat is released when 12.1 g of Al react with O2(g) at 25 °C and 1 atm? 0 - 104 kJ 0 -3.59 x 105 kJ -1.50 x 103 kJ O-376 kJ A 77.0-mL sample of a 0.203 M potassium sulfate solution is mixed with 55.0 mL of a 0.226 M lead(II) nitrate solution and this reaction...
A silver cube with an edge length of 2.25 cm and a gold cube with an...
A silver cube with an edge length of 2.25 cm and a gold cube with an edge length of 2.72 cm are both heated to 88.8C and placed in 101.5 mL of water at 19.6'C. What is the final temperature of the water when thermal equilibrium is reached? Substance gold silver water Specific heat (J/g.°C) 0.1256 0.2386 4.184 Density (g/cm) 19.3 10.5 1.00 Tonal 11 'C Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g)...
#4.(25pts) Consider the reaction AH (kJ/mole) 5 CO2(g) + SizN() ----> 3 SiO(g) + 2 N2O(s) + 5 CO(g) AH = 2023.75 kJ/mole (1) Use the above information as well as heat of formation data in the appendix of your textbook to calculate AH (Si,N.(s)) in kJ/mole. Additional information: AH (SiO(g)) = 1.94 x 109 kJ/mole 6) How many kJ of heat are absorbed when 1.2 lbs of Si N.(s) react according to the above equation? 1 lb = 453.6...
3. For the reaction, P,(s, red) + 10 CL(g) a) AH°(in the units of kcal, kJ, and liter-atm) b) AE (in the units of kJ) c) work (w) (in the units of kJ) 4 PCl,(g), calculate: АН, Р =-73.6 kJ mol 4(s,red) AHP PCI,(g) = -398.9 kJ mol 6. For a chemical process 50. kJ of heat energy were released and 20. kJ of work were done by the system. Calculate AE for this process.
GENERAL CHEMISTRY GROUP STUDY SB The first 3 problems are to be submitted today. #1.(30pts, 15 pts each) (c) Consider a 135 meter high waterfall. If the decrease in potential energy of the water (i.e., mgh) is totally converted into heat, calculate the temperature difference between the top and bottom of the waterfall. Data: m-mass, g- acceleration due to gravity 9.81 m/s. The specific heat of water- 4.184 J/(g "C). (d) If a system absorbs 30.0 J of heat from...
Experiment 13-Post-Lab Assignment 1. Athletes use cold packs containing ammonium nitrate solutions to ice their injuries. A 1.25 G sample of ammonium nitrate is dissolved in 25.0 mL of water to form a solution. The temperature of the solution falls from 25.8°C to 21.9°C. Find the enthalpy of the reaction (AH ), in kJ/mol. Assume the density of water is 1.00 g/mL and the heat capacity of the total solution to be 4.184 J/g °C 2. Calculate AHⓇ in kJ/mol...
Question 4 of 4 > The enthalpy changes, AH, for three reactions are given. H, ()0,()H,O) Ca(s) +2H (aq) Ca2 (aq) +H,(g) CaO(s) +2H (aq) - AH=-286 kJ/mol AH= -544 kJ/mol Ca2 (aq) +H,O() AH =-193 kJ/mol Using Hess's law, calculate the heat of formation for CaO(s) using the reaction shown. 0,()Ca) Ca(s) + kJ/mol ΔΗ- TOOLS During an experiment, a student adds 1.81 g CaO to 300.0 mL of 1.000 M HCI. The student observès a temperature increase of...
2. Calculate AH (expressed in kJ/mol) for the following reaction based on the thermochemical information given: Na +Crce → NaCl AH ? Nas) + 2Cl2(g) → Nap + Cle AH = 230 kJ/mol Nag) + Cl → Na(+ Cl® AH = 147 kJ/mol Na(s) + Cl2(e) → NaCl) AH = -411 kJ/mol 3. Consider the reaction: 2HCl) + Ba(OH)2(aq) → BaCl(aq) + 2 H200 AH--118 kJ/mol a. Calculate the heat produced when 700.0 mL of 0.500 M HCl is mixed...
3. When 10 mL of 2.0 M HCl is combined with 30 mL of 0.667 M NAOH a temperature change of 6.9 °C was observed. How much heat was given off per mole of water produced? ASsume the volumes are additive and that this NaCl solution has a density of 1.02 g/mL and a specific heat of 4.00 J/g-C. 2. How much heat is needed to change 32 g of 4.A 0.865 g sample of candy is burned in a...
UL. HAL IVCI U IS DIUROFIN S 2. (15 pts) A 83.5 g sample of a metal alloy is heated to 88.1°C and it is then placed in a coffee-cup calorimeter containing 30.0 g water at 15.0°C. The final temperature of the metal + water is 25.3 "C. Calculate the specific heat of metal alloy, in J/g °C), assuming no heat escapes to the surroundings or is transferred to the calorimeter. The specific heat of water is 4.184 J/g °C)....
The thermochemical equation for the reaction is shown below: 4 Al(s) + 3 O2(g) → 2 Al2O3(s) AH = -3352 kJ How much heat is released when 12.1 g of Al react with O2(g) at 25 °C and 1 atm? 0 - 104 kJ 0 -3.59 x 105 kJ -1.50 x 103 kJ O-376 kJ A 77.0-mL sample of a 0.203 M potassium sulfate solution is mixed with 55.0 mL of a 0.226 M lead(II) nitrate solution and this reaction...
A silver cube with an edge length of 2.25 cm and a gold cube with an edge length of 2.72 cm are both heated to 88.8C and placed in 101.5 mL of water at 19.6'C. What is the final temperature of the water when thermal equilibrium is reached? Substance gold silver water Specific heat (J/g.°C) 0.1256 0.2386 4.184 Density (g/cm) 19.3 10.5 1.00 Tonal 11 'C Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g)...
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