We now consider three moles of ideal gas at the same initial state (3.0 l at 273 k). this time, we will first perform an isobaric compression, then an isothermal expansion to bring the gas to the final state with the same volume of 3.0 l, and at temperature 110 k. hint (a) how much work (in j) is done on the gas during the isobaric compression?

The work was done on the gas during the isobaric compression is: 4065.78 (Joules)

Explanation:

We need to use the ideal gas law where P is the pressure, V is the volume, n the moles number, T the temperature and R is the ideal gas constante which value is:, replacing the values for the first state, we get: and the second state is:, but we need to know what was the work was done on the gas during the isobaric compression that will be the difference between first and second state's energy so: 6809.55-2743.78=4065.78(Joules).

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =