Posted by **Val** on Monday, March 8, 2010 at 11:16pm.

Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial

amounts of A and B are mixed together, and the mixture in each case is allowed to come to

equilibrium. Which one of these experiments would yield values for the amounts of A and B

present at equilibrium different from all the other experiments?

a. 3.0 moles A, 4.5 moles B

b. 4.5 moles A, 3.0 moles B

c. 1.5 moles A, 4.5 moles B

d. 7.5 moles A, no B

e. 0.5 moles A, 7.0 moles B

The answer is given as C....but I have absolutely no idea what is going on here....

No one has answered this question yet.

- Chemistry -
**DrBob222**, Tuesday, March 9, 2010 at 12:02am
I will do one of these and let you finish.

A........B

4.75....3.75 for experiment a.

If we start with A = 3.0 and B = 4.5, then we change by x. So A must increase to 3.0 + x and B must decrease by 4.5 - x. Set those equal to obtain

3.0+x = 4.5-x, solve for x and I obtained 0.75. Therefore, at equilibrium A will be 3.0 + 0.75 = 3.75 and B will be 4.5 - 0.75 = 3.75

If you go through the series like that, solving for x in each and put the equilibrium values in a table such as the one I started at the top, you will find that the equilibrium concns are 3.75 for A and 3.75 for B EXCEPT for C where they are 3.00 and 3.00. I must be honest and tell you that I've never seen a problem like this one before and I've been at this chemistry business for more than 65 years. Good luck to you.

## Answer This Question

## Related Questions

- Chemistry - Consider the gas-phase equilibrium A ⇌ B. In a series of ...
- Chemistry - The equilibrium constant is 16 for the gas phase reaction SO2 + NO2...
- chm152 - Consider the following equilibrium: 5.0 moles of are placed in a 10.0 L...
- Chemistry 30 - A mixture of 2.5 moles of H2O and 100 g of C are placed in a 50.0...
- CHM 152 - Consider the following equilibrium: PCl5 = PCl3+ Cl2 5.0 moles of are...
- Chemistry - a 1.00-mol sample of phosphorus pentachloride placed in 10.0-L ...
- Chemistry*** - A mixture containing 19.8 moles of H2 and 7.2 mole of I2 was ...
- Chem - A mixture of 2.5 moles of H2O and 100 g of C are placed in a 50.0 L ...
- chemistry - A mixture of 0.100 mol NO, 0.200 mol H2 and 0.0800 mol N2 were ...
- Chem - Consider the reaction: A(g)⇌2B(g) Find the equilibrium partial ...

More Related Questions