An atom of helium has a radius of 31. pm and the average orbital speed of the electrons in it is about 4.4x 10 m/s calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of helium. write your answer as a percentage of the average speed, and round it to 2 significant digits x 10

The question is incomplete, here is the complete question:

An atom of helium has a radius of 31. pm and the average orbital speed of the electrons in it is about . Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of helium. Write your answer as a percentage of the average speed, and round it to 2 significant digits

The percentage of average speed is 41 %

Explanation:

We are given:

Radius of helium atom = 31 pm =    (Conversion factor:   )

So, diameter of helium atom =

The diameter of the atom will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

where,

= uncertainty in position = d =

= uncertainty in momentum  =

m = mass of electron =

h = Planck's constant =

Putting values in above equation, we get:

To calculate the percentage of average speed, we use the equation:

We are given:

Average orbital speed =

Putting values in above equation, we get:

Hence, the percentage of average speed is 41 %

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

i believe the answer is true.