PART A) Below are 3 isomers of C3H9N, which one has the highest vapor pressure a

Question

PART A) Below are 3 isomers of C3H9N, which one has the highest vapor pressure at 0 degrees Celsius?

CH3

I

1) CH3-CH2-NH

2) CH3-CH2-CH2-NH2

3) CH3

I

CH3-N

I

CH3

PART B) Consider a system of 4 gases. The equilibrium concentration of each product is 1.3 M. The equilibrium concentrations of the reactants are equal. The equilibrium is shown here.

A + B <==> C + D K=2.6

What is the equilibrium concentration of gas A?

1) 0.80 M

2) 0.20 M

3) 2.5 M

4) 1.6 M

5) 1.2 M

PART C) Given the equation A(g)<==> B(g) + 2C(g), at a particular temperature, K = 1.4 x 10^5. If you mixed 1.2 mol B, 0.050 mol C, and 0.003 mol A in a 1.0 L container, in which direction would the reaction initially proceed once the compounds were mixed?

1) the mixture is in equilibrium

2) to the left

3) to the right

Explanation / Answer

A) 2

B) 1 , since 2.6 = 1.3^2/(x^2) , x = 0.8

C)3

Q = (0.05^2)(1.2)/0.03 = 0.1 , Q < K , hence reaction goes to right

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