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Q.

A sample of gas measured at 20° C and 4.0atm is heated to 40° C at constant volume. Which statement(s) is (are) true of the gas after heating relative to its initial state?
(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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a

P only

b

P and S only

c

Q and R only

d

Q and S only

answer is A.

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Detailed Solution

A sample of gas measured at and is heated to $40^{\circ} C$ at constant volume. The average molecular kinetic energy is increased because gases' kinetic energy and temperature are inversely correlated. This implies that kinetic energy increases as temperature increases.

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