Near sea level, the atmosphere is composed of 78% nitrogen and 20% oxygen. Other trace gases make up the remaining 2%. At room temperature, consider the following statements.
i. all the gas molecules move at the same speed.
ii. the nitrogen gas molecules, on average, move faster than oxygen molecules.
iii. the nitrogen gas molecules, on average, move faster than the oxygen molecules.
iv. some nitrogen gas molecules could move faster than some of the oxygen gas molecules.
v. some nitrogen gas molecules could move slower than some of the oxygen gas molecules.
Which of these are correct?
a. i
b. ii & iv
c. iii & iv
d. ii, iv, & v
e. all are correct
Answers: 3
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