Chemistry Past Questions and Answers

If the change in free energy of a system is -899 Jmol^-1 and the entropy change is 10Jmol^-1k^-1 at 250C, calculate the enthalpy change.

In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?

In a chemical reaction, the change in concentration of a reactant with time is

Cr ₂O\(\frac{2 -}{7}\) (aq) + H ₂O(1)⇌ 2CrO \(\frac{2 -}{4}\) (aq) + 2H ⁺ (aq)
What happens to the reaction above when the hydrogen ion concentration is increased?

Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid?