PASSAGE II
A chemist conducted an experiment using 3
gases: hydrogen (H2), carbon monoxide (CO), and
oxygen (O2). For each gas, the chemist performed
the following steps in order:
1. She fitted a 5 liter (L) stainless steel vessel with a
cap that included a vacuum pump, a gas inlet valve,
and an internal pressure-temperature display. (The
internal pressure-temperature display showed both
the real-time pressure and temperature inside the
vessel after the cap was fitted.)
2. She vacuumed air out of the vessel until the
internal pressure was 0.00 kilopascal (kPa).
3. She placed the vessel on a scale and calibrated
the scale to 0.00 gram (g).
4. She added a predetermined amount of H2, CO, or
O2 to the vessel.
5. When the internal temperature of the vessel
reached equilibrium at 23 degrees Celsius (°C), she
recorded the mass of the gas inside the vessel and
the pressure inside the vessel.
6. Steps 1-5 were repeated several times with
different amounts of CO, H2, and O2.
Steps 1-6 were then repeated using a 10 L vessel,
instead of the 5 L vessel. All results are set forth in
Figures 1 and 2.
Figure 1
Figure 2
Based on Figure 1, the pressure inside the 5 L
vessel when it contained 375 grams of hydrogen
gas was:
A.
between 0 and 50 kPa.
B.
between 50 and 100 kPa.
C.
between 150 and 200 kPa.
D.
greater than 200 kPa.