Questions 7-9 refer to the following information. At 27°C, five identical rigid 2.0 L vessels are fi — States of Matter Chemistry Question
Question
Questions 7-9 refer to the following information.
At 27°C, five identical rigid 2.0 L vessels are filled with N2(g) and sealed. Four of the five vessels also contain a 0.050 mol sample of NaHCO3(s), NaBr(s), Cu(s), or I2(s), as shown in the diagram. [VISUAL]
At 127°C, the entire sample of I2 is observed to have vaporized. How does the mass of vessel 5 at 127°C compare to its mass at 27°C?
A.
The mass is less, since the I2 is in the vapor phase.
B.✓ Correct
The mass is the same, since the number of each type of atom in the vessel is constant.
C.
The mass is greater, since the I2 will react with N2 to form NI3 , which has a greater molar mass.
D.
The mass is greater, since the pressure is greater and the particles have a higher average kinetic energy.
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