A few challenging Chemistry questions?

Posted on 2015-11-18 07:19:00 in Chemistry by ANDRE

1. At a particular temperature 8.0 mol NO2 gas is placed in a 1.0-L container. Over time the NO2 decomposes to NO and O2:

2NO2(g) 2NO(g) + O2(g)

At equilibrium the concentration of NO(g) was found to be 4.7 mol/L. Calculate the value of K for this reaction (using units of mol/L for the concentrations).

2. At a particular temperature a 2.00-L flask at equilibrium contains 2.4x10-4 mole of n2, 2.5x10-5 mole of 02, and 2x-2 mole of n20. Calculate K at this temperature for the reaction

K =

3. At a certain temperature, K = for the reaction

FeSCN2+(aq) ? Fe3+(aq) + SCN-(aq)

Calculate the concentrations of Fe3+, SCN-, and FeSCN2+ in a solution that is initially 2.0 M FeSCN2+.

[FeSCN2+] =
M

[Fe3+] =
M

[SCN-] =
M

4. The gas arsine, AsH3, decomposes as follows:

2AsH3(g) ? 2As(s) + 3H2(g)
In an experiment at a certain temperature, pure AsH3(g) was placed in an empty, rigid, sealed flask at a pressure of 392.0 torr. After 48 hours the pressure in the flask was observed to be constant at 491.0 torr.

Calculate the equilibrium pressure of H2(g).

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