Consider a mixture of two gases, A and B, confined in a closed vessel. A quantity of

Question:

Consider a mixture of two gases, A and B, confined in a closed vessel. A quantity of a third gas, C, is added to the same vessel at the same temperature. How does the addition of gas C affect the following?
(a) The partial pressure of gas A,
(b) The total pressure in the vessel,
(c) The mole fraction of gas B.