3. If a certain quantity of gas has a volume of 30 cm3 at a pressure of 1 × 105 Pa, what is its volume when the pressure is a. 2 × 105 Pa,
b. 5 × 105 Pa?
Assume the temperature remains constant.
Plz help me ASAP!!!

We know that:

                                            .......(1)

Given at ,

a)

When , ?

Using equation (1)

b)

When ,

using equation (1)

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 =