A sample of gas measured at 20^(@)C C an...

A sample of gas measured at `20^(@)C` C and 4.0 atm is heated to `40^(@)C` at constant volume. Which statement(s) is (are) true of the gas after heating relative to its initial satate?
(P) The average molecular kinetic energy is increased.
(Q) The average molecular speed is unchanged.
(R) The pressure of the gas is increased to 8.0 atm.
(S) The number of molecular collisions per second is unchanged.

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