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Chemistry Problems: Equilibrium Concentration of Gas

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A 3.00 L flask initially contains 1.50 mol of gas A and 0.450 mol of gas B. Gas A decomposes according to:
3A <-> 2B + C
DeltaH = +90kJ mol^-1
The equilibrium concentration of gas C is 0.100 mol/L.

What is the equilibrium concentration of gas A?
What is the equilibrium concentration of gas B?
What is the equilibrium constant K?
If the temperature of the flask was increased, what would happen to the equilibrium concentration of gas A?
What is the H+ in a solution that has a pH of 2.3? Report your answer to 2 significant figures.
The KS of nitrous acid, HN)2 is 4.0 x 10^-4. What is the pH of 0.25 M HNO2? Report your answer to 2 decimal places.

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The expert examines equilibrium concentrations of gas for chemistry problems.

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3A --> 2B+C
Molar amount for C: 0.1*3=0.3 mol
Molar amount for A consumed: 0.3*(3/1)=0.9 mol
The remaining molar amount for A: 1.5-0.9=0.6 mol
Q1: ...

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