[yoyohs]

Consider the following equilibrium at 400 K.

H2 (g) + I2 (g) ⇌ 2HI with K = 6.

If initially 4.0 bar of HI is placed in a 2.4 L vessel, what is the total pressure at equilibrium?

[sjb]

What have you tried? You might want to consider putting the phase of the hydrogen iodide in.

[yoyohs]

What have you tried? You might want to consider putting the phase of the hydrogen iodide in.

the phase wasn't given in the question.

[Meter]

What have you tried? You might want to consider putting the phase of the hydrogen iodide in.

the phase wasn't given in the question.

Look up the BP data for hydrogen iodide and try to infer what phase it would be in at T = 400 K (much above RT).

[billnotgatez]

Just a FYI  to aid in the discussion
Extract From WIKI
Hydrogen iodide
Properties
Chemical formula   HI
Molar mass   127.904 g/mol
Appearance   Colorless gas
Density   2.85 g/mL (-47 °C)
Melting point   −50.80 °C (−59.44 °F; 222.35 K)
Boiling point   −35.36 °C (−31.65 °F; 237.79 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).