An ideal gas, initially at a pressure of 11.2 atm and a temperature of 299 K, is allowed to expand adiabatically until its volume doubles. Required:
What is the gas’s final pressure, in atmospheres, if the gas is diatomic?

The pressure is  

Explanation:

From the question we are told that

   The initial pressure is

   The  temperature is  

Let the first volume be   Then the final volume will be  

 Generally for a diatomic  gas

Here r is the radius of the molecules which is  mathematically represented as

Where are the molar specific heat of a gas at constant pressure and  the molar specific heat of a gas at constant volume with values

=>  

=>  

=>  

=>  

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.