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Q.

Two samples of gas, one of argon and one of helium, have the same pressure, temperature and volume. Which statement is true assuming both gases behave ideally?

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a

The helium sample contains more atoms than the argon sample and the helium atoms have a higher average speed.

b

The two samples have the same number of atoms but the helium atoms have a higher average speed.

c

The two samples have the same number of atoms and both types of atoms have the same average speed.

d

The two samples have the same number of atoms but the argon atoms have a higher average speed.

answer is B.

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Detailed Solution

The two samples have the same number of atoms but the helium atoms have a higher average speed Because its atoms move more quickly on average, helium has higher internal energy.

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