Answer:
A
Step-by-step explanation:
180-91-33=56
Answer:
They encircle the planet
times.
Step-by-step explanation:
Consider the provided information.
We have 2.5 mole of dust particles and the Avogadro's number is ![6.022\times 10^{23}](https://tex.z-dn.net/?f=6.022%5Ctimes%2010%5E%7B23%7D)
Thus, the number of dust particles is:
![2.5\times 6.022\times 10^{23}=15.055\times 10^{23}](https://tex.z-dn.net/?f=2.5%5Ctimes%206.022%5Ctimes%2010%5E%7B23%7D%3D15.055%5Ctimes%2010%5E%7B23%7D)
Diameter of a dust particles is 10μm and the circumference of earth is 40,076 km.
Convert the measurement in meters.
Diameter: ![10\mu m\times \frac{10^{-6}m}{\mu m} =10^{-5}m](https://tex.z-dn.net/?f=10%5Cmu%20m%5Ctimes%20%5Cfrac%7B10%5E%7B-6%7Dm%7D%7B%5Cmu%20m%7D%20%3D10%5E%7B-5%7Dm)
If we line up the particles the distance they could cover is:
![15.055\times 10^{23}\times 10^{-5}=15.055\times 10^{18}=1.5055\times 10^{19}](https://tex.z-dn.net/?f=15.055%5Ctimes%2010%5E%7B23%7D%5Ctimes%2010%5E%7B-5%7D%3D15.055%5Ctimes%2010%5E%7B18%7D%3D1.5055%5Ctimes%2010%5E%7B19%7D)
Circumference in meters:
![40,076km\times \frac{1000m}{1km}=40,076,000 m](https://tex.z-dn.net/?f=40%2C076km%5Ctimes%20%5Cfrac%7B1000m%7D%7B1km%7D%3D40%2C076%2C000%20m)
Therefore,
![\frac{1.5055\times 10^{19}}{40,076,000} = 3.76\times 10^{11}](https://tex.z-dn.net/?f=%5Cfrac%7B1.5055%5Ctimes%2010%5E%7B19%7D%7D%7B40%2C076%2C000%7D%20%3D%203.76%5Ctimes%2010%5E%7B11%7D)
Hence, they encircle the planet
times.