# chemistry

Oh my my test is coming up and I have no idea how to do these questions and when I asked my teacher for help he said you should do it yourself.... Thanks!

An intermediate step in the production of battery acid, sulfuric acid, invoves the information of sulfur trioxide gas from sulfur dioxide and oxygen gases. (this reaction is also the usual first step in the production of acid rain).

The Kp for this reaction at 830degreeC is 0.13. In one experiment, 96.9g of sufur dioxide and 34.6g of oxygen were added to a rxn flask. What must the total pressure in the flask be at eqilibrium if the reaction has an 80% yield of sulfur trioxide. Assume the volume is 3.5L.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Consider the rxn; 4A + B <---> 3C. Initially we had 12 mol of A 12 mol of B in a 2.00L flask, At equilibrium, there is 7.5mol of C in the flask.

Find K and % completion?

1. 👍 0
2. 👎 0
3. 👁 135
1. As I see the the first problem.
2SO2 + O2 ==> 2SO3.
Convert g SO2 to mols, convert that to mols SO3, take 80%. That is mols SO3 we should have at the end of the reaction for an 80% yield. Then calculate SO2 remaining, O2 used up (at 80%) and O2 remaining. Add mols of each and use PV = nRT to determine total P.
Check my thinking.

1. 👍 0
2. 👎 0
posted by DrBob222
2. For the second problem, I posted once and it came out garbled so I erased it and started over. Use the ICE chart to solve this. I can't make a good one on the board but hopefully you can understand what I've written.
4A + B ==> 3C

I = initial concentrations:
for A: 12.0 mols/2.00 L = 6.00 M
for B: 12.0 mols/2.00 L = 6.00 M
for C: o mols/2.00 L = 0 M

C = change:
do this last but I will do the equilibrium and explain what goes in these blanks. You must do change to obtain E.

E = equilibrium:
The problem states we had 7.5 mols C at equilibrium. 7.5 mols/2.00 L = 3.50M goes here which means the change for C must be +3.75; i.e., 0 + 3.75 = 3.75.
If we had +3.75 for change of C, then B must be changed by -3.75/3 = -1.25 M and the final E for compound B is 6.00 - 1.25 = 4.75.
For A: The change for B was -1.25; therefore, the change for A must be 4 x -1.25 = 5.00 which makes E for compound A 6.00 - 5.00 = 1.00.
Now just plug all of those equilibrium numbers into the expression for K and solve for K.

1. 👍 0
2. 👎 0
posted by DrBob222
3. Note I had a typo:
E = equilibrium:
The problem states we had 7.5 mols C at equilibrium. 7.5 mols/2.00 L = 3.50M SHOULD BE 3.75 M goes here which means the change for C must be +3.75; i.e., 0 + 3.75 = 3.75.

1. 👍 0
2. 👎 0
posted by DrBob222
4. Everything was good until this happened:

An intermediate step in the production of battery acid, sulfuric acid, invoves the information of sulfur trioxide gas from sulfur dioxide and oxygen gases. (this reaction is also the usual first step in the production of acid rain).

The Kp for this reaction at 830degreeC is 0.13. In one experiment, 96.9g of sufur dioxide and 34.6g of oxygen were added to a rxn flask. What must the total pressure in the flask be at eqilibrium if the reaction has an 80% yield of sulfur trioxide. Assume the volume is 3.5L.

As I see the the first problem.
2SO2 + O2 ==> 2SO3.
Convert g SO2 to mols, convert that to mols SO3, take 80%. That is mols SO3 we should have at the end of the reaction for an 80% yield. Then calculate SO2 remaining, O2 used up (at 80%) and O2 remaining. Add mols of each and use PV = nRT to determine total P.
Check my thinking.

1. 👍 0
2. 👎 0
posted by Tri

## Similar Questions

1. ### math

i have a test coming up and i have no idea how to do rotations on a cartesian coordinate system. please help me!!

asked by julie on March 7, 2010
2. ### Biolagy

I a have a bioalgy test coming up on nutrients any idea on how to remember all the fats and such? Memorize them. Flashcards make good memory devices. thanks

asked by Rachael Oslan on November 1, 2006
3. ### Math ( Percents as Ratios)

Sue receives a test score of 75% on a test with 20 questions. How many did she get correct? đź‘‰ I need help making these kinds of questions into proportions because I have a Benchmark Test (like a mid year test) coming up & I

asked by Dynasty on December 4, 2014
4. ### Science

My assignment is to make an experiment to investigate the effect different forces have on an objectâ€™s motion. And this should test at least one of the laws of motion. Now all I ask is an example of an experiment I could do. I'm

asked by Lexi on October 6, 2016
5. ### english

Okay so there is a non profit organization called Heifer. This group sends animals to 3rd world countries. It teaches people to raise animals on their own for food. One stipulation to receiving the animal is you have to give two

asked by mark on October 11, 2011
6. ### maths

What is mode n average for 2 students test scores our of 25 for maths. A Test 1: =21 Test 2: =24 Test 3:=19 Test 4: =21 K Test 1:= 18 Test 2:= 19 Test 3:= 19 Test 4:= 17 Test 2:= 19 Test 3:= 19 Test 4:= 17. N Test 1:= 16 Test 2:=

asked by nyle wilkes on November 28, 2016
7. ### math average!

My average is a 74 right now. My grades are 70( which counts as 60% as my grade and i have 2 more major test coming up) 94, 60 (which counts as 25% and i have about 5 more of this coming up) 90,100,83,91,71( i have about 3 more of

asked by Alyssa on February 4, 2013

TIgers pitcher justin throws a basketball staright upward 29.0m/s. Calculate A) the height to which the ball will rise b) the time it takes to reach the highest point c) the speed with which it will return to the same height which

asked by unknown on December 20, 2014
9. ### Language Arts

1. When the speaker in â€śWinterâ€ť says, â€śI collect books / For the coming winterâ€ť, what is her attitude toward the coming cold weather? A. positive B. uninterested** C. fearful D. angry 2. A concerete poem, such as

asked by Hope on February 18, 2016
10. ### Chem. Copper and Chromium. Random Q...

So, I have a general chemistry test. My teacher said to know... "Copper and Chromium exceptions." I have no idea what that means. I am currently learning about Thermochemistry and the Quantum Theory of an Atom. Do you have any

asked by Sarah on November 15, 2008
11. ### chemistry

Q: I just did an online chemisty lab for Oxidation States of Manganese and I'm stuck. I have three test tubes that have been prepared as follows: Tube 1- Starting PH 13.82 2 mL of KMnO4 1 mL of NaOH Tube 2- Starting PH 7 2 mL of

asked by jo on July 27, 2010

More Similar Questions