If a flask were filled with pure co2 to a total pressure of 1 atm, then once equilibrium is reached the total pressure of the system is which?

0.65 atm

Explanation:

The total pressure of the system is reduced to 0.653 bar as it reaches equilibrium at 25.0 ºC, making the final total pressure to be 0.653 bar.

Since 1 atm = 1.013 bar

0.653 bar therefore is 0.65 atm.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)