I understand if reaction is reversed, you change the sign but how to you know to...
I understand if reaction is reversed, you change the sign but
how to you know to reverse the reaction? In the problem, Sand is
converedto pure silicon in a 3 step process. The final step in this
process is as follows: SiCl4 (g) + 2Mg (s) --> 2MgCl (s) + Si
(s) ChangeHrxn=6256kj/mol
What is the enthalpy change if 25.0 mol of silicon tetrachloride is
converted to elemental silicon?
I get the answer by 25 mol SiCl4 x 6256kj/mol=15640kj but I do not
understand why this is neg, not +
Homework Answers
Add Answer to:
I understand if reaction is reversed, you change the sign but
how to you know to...
18. c Sand is converted to pure silicon in a three step process. The third step...
18. c Sand is converted to pure silicon in a three step process. The third step is: SiCl4(g) + 2Mg(s) 2MgCl2(s) + Si(s) AH= -625.6 kJ What is the enthalpy change when 25.0 mol of SiCl(g) is converted to Si(s)? A) -25.0 kJ dE= B) -7820 kJ C) -1.56 x 104 kJ 25 D) -3.13 x 104 kJ
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall...
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall reaction. Correct The change in enthalpy, AH, is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that ? H for an overall reaction is the sum of the values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction PartB What is the enthalpy for reaction 1 reversed? Express your answer...
I don't understand the step by step process to figuring this out. I don't know how...
I don't understand the step by step process to figuring this
out. I don't know how you would calculate percent yield?
Would love answers to all of the questions in part 3!
Thank you!
Practice: Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 155.8 kg of Sio2 reacts with 78.3...
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall...
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall reaction. The change in enthalpy, ΔH, is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that ΔH for an overall reaction is the sum of the ΔH values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction 3Mn+3O2→3MnO2 we could calculate it using the enthalpy values for the following individual...
sorry i was confused here is the correct photo Learning Goal: To understand how to use...
sorry i was confused here is the correct photo
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall reaction The change in enthalpy, AH is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that AH for an overall reaction is the sum of the AH values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction 3Mn +302+3MnO2 we could...
Can you please explain how you’d know which reaction woulf be spontaneous? I dont understand At...
Can
you please explain how you’d know which reaction woulf be
spontaneous? I dont understand
At SATP, which reaction below is spontaneous? O CO2(s)-CO2(0) O Co2(s)-CO2(g) O CO2(g) CO2(0) CO20)-CO2(s)
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of...
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions AH is (pick one) This reaction is spontaneous except below A 31. C AS is (pick one) (pick one) The reverse of this reaction is always spontaneous but proceeds slower at temperatures below-15....
Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide
Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given enthalpy, but they aren't the same thing- correct? Also, if this question gave me delta-H, I know that the heat of formation for 4Al = 0 and 3O2 = 0 because they are elementary species. This would...
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a...
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a 2 Mg(s) +,(@) 2 Mgo (s) AS b. CH206(s) → 2C,H,OH(I) + 2003(g) AS c. 2 NH3(g) + CO2(g) → H2O(l) + NH CONH3(aq) AS d. Cu(s) (at 100°C) → Cu(s) (at 25°C) AS 2. Which two variables can indicate if a reaction is spontaneous or not? 3. The second law of thermodynamics tells us that: a Energy is conserved. b. The entropy of...
1.a) What is the sign of the entropy change for the following reaction? Note: You do...
1.a) What is the sign of the entropy change for the following
reaction? Note: You do not need the standard entropy values
2Zn (s) + O2 (g) ---> 2ZnO (s)
answer
a) 0 (Zero)
b) <0 (Negative)
c) No change
d)> 0 (Positive)
2.c)
ASO = Ensº(product ) - EnS°(reactant ) rxn O 173.6 K-mol -1893 W/K-mol O 6165 /K-mal 0 -1736 K-mol
18. c Sand is converted to pure silicon in a three step process. The third step is: SiCl4(g) + 2Mg(s) 2MgCl2(s) + Si(s) AH= -625.6 kJ What is the enthalpy change when 25.0 mol of SiCl(g) is converted to Si(s)? A) -25.0 kJ dE= B) -7820 kJ C) -1.56 x 104 kJ 25 D) -3.13 x 104 kJ
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall reaction. Correct The change in enthalpy, AH, is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that ? H for an overall reaction is the sum of the values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction PartB What is the enthalpy for reaction 1 reversed? Express your answer...
I don't understand the step by step process to figuring this
out. I don't know how you would calculate percent yield?
Would love answers to all of the questions in part 3!
Thank you!
Practice: Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 155.8 kg of Sio2 reacts with 78.3...
sorry i was confused here is the correct photo
Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall reaction The change in enthalpy, AH is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that AH for an overall reaction is the sum of the AH values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction 3Mn +302+3MnO2 we could...
Can
you please explain how you’d know which reaction woulf be
spontaneous? I dont understand
At SATP, which reaction below is spontaneous? O CO2(s)-CO2(0) O Co2(s)-CO2(g) O CO2(g) CO2(0) CO20)-CO2(s)
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions AH is (pick one) This reaction is spontaneous except below A 31. C AS is (pick one) (pick one) The reverse of this reaction is always spontaneous but proceeds slower at temperatures below-15....
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a 2 Mg(s) +,(@) 2 Mgo (s) AS b. CH206(s) → 2C,H,OH(I) + 2003(g) AS c. 2 NH3(g) + CO2(g) → H2O(l) + NH CONH3(aq) AS d. Cu(s) (at 100°C) → Cu(s) (at 25°C) AS 2. Which two variables can indicate if a reaction is spontaneous or not? 3. The second law of thermodynamics tells us that: a Energy is conserved. b. The entropy of...
1.a) What is the sign of the entropy change for the following
reaction? Note: You do not need the standard entropy values
2Zn (s) + O2 (g) ---> 2ZnO (s)
answer
a) 0 (Zero)
b) <0 (Negative)
c) No change
d)> 0 (Positive)
2.c)
ASO = Ensº(product ) - EnS°(reactant ) rxn O 173.6 K-mol -1893 W/K-mol O 6165 /K-mal 0 -1736 K-mol
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