Homework Answers
Answer – We are given the elements in standard state and asked for which one has not zero standard enthalpy formation.
From the standard enthalpy formation value table-
The Phosphorus P (solid, white) has the standard enthalpy formation is 17.45 kJ/mol. For the P4(s, white) it is zero.
The Calcium (Ca(s)), bromine liquid (Br(l)) , and Silicon solid (Si(s)) has the standard enthalpy formation zero.
The scandium gas (Sc(g)) has the standard enthalpy formation is 377.82 kJ/mol and for scandium solid, it is zero.
Thus, the ΔHof is not zero for Sc(g)
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number 21 thank you
QUESTION 21 Of the following, AH®f is not zero for O P4...
Which of the following has a AHºf value of zero? Select one: O Fe(s) o O(g)...
Which of the following has a AHºf value of zero? Select one: O Fe(s) o O(g) O H20(1) O Ca(g) AH°(reaction) = Select one: AH® (products) + AH®f(reactants) AH® (products) - AHºt(reactants) AH°f(reactants) - AH°(products) -AH°f(reactants) - AH°f(products) Forming bonds is always Select one: O spontaneous O endothermic o neutral exothermic
QUESTION 18 5 poi For the following reactions, the AH is not equal to AH®f for...
QUESTION 18 5 poi For the following reactions, the AH is not equal to AH®f for the product except for CH4(g) + 2Cl2(g) - CH2Cl2(1) + 2HCl(g) Xe(g) + 2F2(g) - XeF4(9) 2CO(g) + O2(g) - 2009) N2(g) +03(9) - N203(9) C(diamond) + O2(g) - CO2(g) QUESTION 19 If a hydrogen atom electron jumps from the n=2 orbit to the n=6 orbit, energy is released.
Find AH®rxn for the reaction 2Ag2S(s) + 2H2O(0) - 4Ag(s) + 2H2S(g) + O2(g). [AH°F (Ag2S(s))...
Find AH®rxn for the reaction 2Ag2S(s) + 2H2O(0) - 4Ag(s) + 2H2S(g) + O2(g). [AH°F (Ag2S(s)) = -326 kJ/mol; AH+ (H2S(g)) = -20.5 kJ/mol; AHT (H2000) = -285.5 kJ/mol] O 575.2 kJ/mol 0 565.2 kJ/mol O None of the above O 585.2 kJ/mol 0 595.2 kJ/mol
Question 6 The molarity of a solution can be determined from o the number of mmoles...
Question 6 The molarity of a solution can be determined from o the number of mmoles of solute per milliliter of solution. o the number of moles of solute per kilogram of solution. o the number of moles of solute per kilogram of solvent. o the number of moles of solute per liter of the solvent D Question 7 Hydrazine, N2H4, is a liquid used as a rocket fuel. It reacts with oxygen to yield nitrogen gas and water. N2H4(lig)...
1.(3pts) Use the following data to determine the AH... of 2 CHO(1) + 21 Og) -->...
1.(3pts) Use the following data to determine the AH... of 2 CHO(1) + 21 Og) --> 14 COMg) + 16 HẠO(g) Substance AH(kJ/mol) Substance AH?(kJ/mol Data: C Hag) CH,OH(L) C.H.O(1) CH, O) H.O(g) CO(g) O.(g) 20.9 -239.0 -277.0 -316 0 -241.82 -110.53 C.H.(5) CH,OH(g) C3H20 (1) C-HBO(l) H.O(1) CO; N (8) -104,0 -201.0 -298.6 -340.0 -285.83 -393.51 2.(2pts) If you are given 338,0 g 0 () and a sufficient amount of the other reactant, calculate the heat associated with reaction...
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...
number 6and 8 number 2.a and2.b + number 4.Thank you 6- Let X he o ando...
number 6and 8
number 2.a and2.b + number 4.Thank you
6- Let X he o ando Variable withapre babili den si punchen (pdf) F(x)-ヤーにとく2 , Zero elsewhere. Find the cumulative distrib ien pu ctio. CC DFJ and He prabaloilctg density Function-f y= x2 use chebychevs inequalits to dekermine a lower beund fo (1-x,-%) , Let x, and X2 hove the joint pdf t(A,,) (8)
Question 5 What is AHºp for the following reaction? 2H2O2(1) - 2H2O(1) + O2(g) AH® (H2O(l)...
Question 5 What is AHºp for the following reaction? 2H2O2(1) - 2H2O(1) + O2(g) AH® (H2O(l) = -285.8 kJ/mol, AHºf(H2O2(0) = -187.6 kJ/mol -98.2 kJ/mol @ -473.4 kJ/mol -196.4 kJ/mol 98.2 kJ/mol -946.8 kJ/mol Previous
Given the data in the table below, AH®rxn for the reaction Ca(OH)2 + 2H3A504 - Ca(H2AsO4)2...
Given the data in the table below, AH®rxn for the reaction Ca(OH)2 + 2H3A504 - Ca(H2AsO4)2 + 2H20 kl. Substance | AH°F (kJ/mol) Ca(OH)2 -986.6 H3 AsO4 -900.4 Ca(H2AsO4)2 -2346.0 H20 -285.9 0-130.4 0-1048.0 0-79.0 0-476.4 O-76.4 Previous Page Next Page Pag Question 40 (2.5 points) The Lewis electron-dot formula for PH3 has O four bonding pairs of electrons. two bonding pairs and two lone pairs of electrons. three bonding pairs and one lone pair of electrons. one bonding pair...
21. See the figure to the right (enthalpy on y-axis) reaction progress on X-axis. Which of...
21. See the figure to the right (enthalpy on y-axis) reaction progress on X-axis. Which of the following is true? Consider the reaction: 2 H2(g) + O2(g) + 2 H20) Enthalpy 2H₂g) + 024] L2H₂O(1) Reaction Progress a. b. c. d. A = AH for bond breaking. B=AH for bond formation A = AH for bond breaking B - AH for bond formation A=AH for bond formation. B=AH for bond breaking A = AH for bond formation. B=AH for bond...
Which of the following has a AHºf value of zero? Select one: O Fe(s) o O(g) O H20(1) O Ca(g) AH°(reaction) = Select one: AH® (products) + AH®f(reactants) AH® (products) - AHºt(reactants) AH°f(reactants) - AH°(products) -AH°f(reactants) - AH°f(products) Forming bonds is always Select one: O spontaneous O endothermic o neutral exothermic
QUESTION 18 5 poi For the following reactions, the AH is not equal to AH®f for the product except for CH4(g) + 2Cl2(g) - CH2Cl2(1) + 2HCl(g) Xe(g) + 2F2(g) - XeF4(9) 2CO(g) + O2(g) - 2009) N2(g) +03(9) - N203(9) C(diamond) + O2(g) - CO2(g) QUESTION 19 If a hydrogen atom electron jumps from the n=2 orbit to the n=6 orbit, energy is released.
Find AH®rxn for the reaction 2Ag2S(s) + 2H2O(0) - 4Ag(s) + 2H2S(g) + O2(g). [AH°F (Ag2S(s)) = -326 kJ/mol; AH+ (H2S(g)) = -20.5 kJ/mol; AHT (H2000) = -285.5 kJ/mol] O 575.2 kJ/mol 0 565.2 kJ/mol O None of the above O 585.2 kJ/mol 0 595.2 kJ/mol
Question 6 The molarity of a solution can be determined from o the number of mmoles of solute per milliliter of solution. o the number of moles of solute per kilogram of solution. o the number of moles of solute per kilogram of solvent. o the number of moles of solute per liter of the solvent D Question 7 Hydrazine, N2H4, is a liquid used as a rocket fuel. It reacts with oxygen to yield nitrogen gas and water. N2H4(lig)...
1.(3pts) Use the following data to determine the AH... of 2 CHO(1) + 21 Og) --> 14 COMg) + 16 HẠO(g) Substance AH(kJ/mol) Substance AH?(kJ/mol Data: C Hag) CH,OH(L) C.H.O(1) CH, O) H.O(g) CO(g) O.(g) 20.9 -239.0 -277.0 -316 0 -241.82 -110.53 C.H.(5) CH,OH(g) C3H20 (1) C-HBO(l) H.O(1) CO; N (8) -104,0 -201.0 -298.6 -340.0 -285.83 -393.51 2.(2pts) If you are given 338,0 g 0 () and a sufficient amount of the other reactant, calculate the heat associated with reaction...
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...
number 6and 8
number 2.a and2.b + number 4.Thank you
6- Let X he o ando Variable withapre babili den si punchen (pdf) F(x)-ヤーにとく2 , Zero elsewhere. Find the cumulative distrib ien pu ctio. CC DFJ and He prabaloilctg density Function-f y= x2 use chebychevs inequalits to dekermine a lower beund fo (1-x,-%) , Let x, and X2 hove the joint pdf t(A,,) (8)
Question 5 What is AHºp for the following reaction? 2H2O2(1) - 2H2O(1) + O2(g) AH® (H2O(l) = -285.8 kJ/mol, AHºf(H2O2(0) = -187.6 kJ/mol -98.2 kJ/mol @ -473.4 kJ/mol -196.4 kJ/mol 98.2 kJ/mol -946.8 kJ/mol Previous
Given the data in the table below, AH®rxn for the reaction Ca(OH)2 + 2H3A504 - Ca(H2AsO4)2 + 2H20 kl. Substance | AH°F (kJ/mol) Ca(OH)2 -986.6 H3 AsO4 -900.4 Ca(H2AsO4)2 -2346.0 H20 -285.9 0-130.4 0-1048.0 0-79.0 0-476.4 O-76.4 Previous Page Next Page Pag Question 40 (2.5 points) The Lewis electron-dot formula for PH3 has O four bonding pairs of electrons. two bonding pairs and two lone pairs of electrons. three bonding pairs and one lone pair of electrons. one bonding pair...
21. See the figure to the right (enthalpy on y-axis) reaction progress on X-axis. Which of the following is true? Consider the reaction: 2 H2(g) + O2(g) + 2 H20) Enthalpy 2H₂g) + 024] L2H₂O(1) Reaction Progress a. b. c. d. A = AH for bond breaking. B=AH for bond formation A = AH for bond breaking B - AH for bond formation A=AH for bond formation. B=AH for bond breaking A = AH for bond formation. B=AH for bond...
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