To find the volume of a flask, it was first evacuated so that it contained no gas at all. when 4.40 g of carbon dioxide was introduced, it exerted a pressure of 90 kpa at 27 celcius

We use ideal gas equation,

,

 or

Here, V is the volume, P is pressure and T is temperature and   , m is the mass and M is the molar mass and R is universal gas constant its value of 8.3144621 L kPa/K mol

Given, , and  .

The molar mass of the carbon dioxide, .

Substituting these values in above equation, we get

.

Thus, the volume of the flask is 2.77 L.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

0.11 m/s and 0.28 m/s should be correct