Question 5 In a chemical reaction between gases, 500cm of oxygen reacts with hydrogen to
form water in a closed container. After the reaction has taken place the container is
left to stand until the temperature and pressure of the gas are the same as they were
before the reaction. There are no unreacted molecules of oxygen or hydrogen
remaining in the container,
a Write down a balanced chemical equation to represent the reaction
b. Calculate the volume of hydrogen present at the start
c. Calculate the volume of water present after the reaction​

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.

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 =