A box of gas contains a mixture of two different gases, shown in the figure as blue molecules and red molecules. The temperature and pressure in the box are measured at STP (T = 300 K and p = 1 atmosphere). The blue molecules have 4 times the mass of the red molecules, but there are equal numbers of each kind in the box.
A. Which molecules contribute more to the pressure measured by a meter in the wall of the box?
 The blue molecules
 The red molecules
 They contribute equally.
 You cannot tell from the information given.


B. Which molecules are moving faster?
 On average, the blue molecules are moving twice as fast as the red.
 On average, the red molecules are moving twice as fast as the blue.
 On average, the blue molecules are moving faster than the red but not twice as fast.
 On average, the red molecules are moving faster than the blue but not twice as fast.
 You canâ€™t tell from the information given.
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