# chemistry

all reversible reactions

Kp= 3.5 X 10^4
temp: 1495K

N2(g)+3H2(g) reversible 2NH3(g)

1/2N2(g) + 3/2H2(g) reversible NH3(g)

what is the value of K at the temp.

what is the process for this?

1. 👍 0
2. 👎 0
3. 👁 247
1. It's easier than it looks on the surface.
Let's call Kp = 3.5 x 10^4 the original Kp. The second equation is just 1/2 of the first one; therefore, new Kp = (original Kp)1/2.
If you had 2N2 + 6H2 <==> 4NH3, then
new Kp = (original Kp)2 . In other words, just raise the original Kp to whatever power the new equation is relative to the original coefficients. In these two examples, that is 1/2 and 2.

1. 👍 0
2. 👎 0
2. where does the temperature factor in? I raised it to 1/2 and got 1.75, but that was not the right answer.
(I forgot to mention this, but the first reaction is the original one)
Could you put a example up? I am very much a visual learner and need to see it before I can do it.

1. 👍 0
2. 👎 0
3. As long as the temperature doesn't change, K doesn't change. So for 1/2 the reactants then the new Kp = 3.5 x 10^4)1/2.
How did you get 1.75? I'm not surprised the key told you that was wrong.
I have square root of 3.5 x 10^4 = 187 and not 1.75.
Let me know if still have problems. (I just see how you got that number. You divided 3.5/2 = 1.75. You forgot the exponent of 10^4 I think.)

1. 👍 0
2. 👎 0
4. Is there a good website that has good examples for ap chemistry ranging from easy to difficult?

1. 👍 0
2. 👎 0
5. Here is one that I use often to direct students. Its' written very well and it's an AP site.

1. 👍 0
2. 👎 0
6. calculate the standard enthalpy change for each of the following reactions. N2O4(g)+4H2(g)=N2(g)+4H2O(g)

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry

Predict whether the following reactions will be exothermic or endothermic A) N2(g)+ 3H2(g) --> 2NH3(g) B) S(g) +O2(g) ---> SO2(g) C) 2H2O(g) ---->2H2(g) + O2(g) D) 2F(g) +F2(g) Bond H-H 432 kj/mol N-N(triple bond) 942 kj/mol O=O

Is the following definition of complementary angles reversible? If yes, write it as a true biconditional Complementary angles are two angles whose sum measures to 90 degrees - The statement is not reversible - Yes, if angles are

3. ### Geometry

Is the following definiiton of supplementary reversible? If yes, write it as a true biconditional. Supplementary angles are two angles whose measures sum to 180. a. Yes, if angles are supplementary, the their measures sum to 180.

4. ### Chemistry

Calculate Delta H for 4NH3 + 5O2 --> 4NO + 6H2O using: N2 +O2 --> 2NO DH= -180.5 kJ N2 + 3H2 --> 2NH3 DH= -91.8 kJ 2H2 + O2 --> 2H2O DH= -483.6 kJ

1. ### Geometry

1) What are the converse, inverse, and contrapositive of the statement? Which statements are true? If the figure is a rectangle with sides 2 cm and 3 cm, then it has a perimeter of 10cm. My A: the statement is not true. 2) What

2. ### Chemistry

At 1100 K, Kp=0.25 for the following reaction. 2SO2(g) + O2(g) (reversible arrows) 2SO3(g) What is the value of K at this temperature? This is what I have so far: I did Kc=0.25(1100(0.0821))^-1 and got Kc=0.00276. That is

3. ### Chemistry

Calculate Delta H for the reaction CH4(g)+NH3(g)-->HCN(g)+3H2(g) given, N2(g)+3H2(g)->2NH3(g) DeltaH=-91.8kj C(s)+2H2(g)->CH3(g) DeltaH=-74.9kj h2(g)+2C(s)+N2(g)->2HCN(g) DeltaH=270.3kj

4. ### Math

is the definition of a straight angle see below reversible? if yes, write as a true biconditional. A straight angle is an angle that measures 180 degrees. I’m stuck. Can someone help me?

1. ### Science

A reversible heat engine operates with an efficiency of 50%. If during each cycle it rejects 150 cal to a reservoir of heat at 30°C, then what is the temperature of the other reservoir and how much work does it carry out per

2. ### Thermodynamic

One mole of CO2 is to be compressed adiabatically from 1 bar and 25 C. Because of irreversibilities and poor design of the compressor the compressor work required is found to be 25 %greater than that for a well-designed

3. ### Chemistry

1. How many moles of ammonia NH3 are produced when 0.45 moles of nitrogen N2 reacts? N2 + 3H2 yields 2NH3 2. How many mililiters of water will be produced when 2.05 g of hydrogen reacts? The density of water is 1.00 g/mL ? 2H2 +

4. ### Chemistry

Is photosynthesis a reversible reaction?