There are 7.708 x 10²² atoms present in 25.8 g of Hg.
Number of Atoms
The number of atoms in an element is represented by the Avogadro's number, which tells us the number of atoms or molecules that are present in a mole of a substance.The number is 6.0221415 x 10²³
To get this, when given the mass of the element, we must first
- find the moles
- Then multiply the amount of moles by Avagadro's number
Remember that Number of moles =Mass/Molar mass
a. 25.8 g of Hg
Number of moles = 25.8g of Hg /200.59 g/mol =0.128moles
Nmber of atoms =0.128moles x 6.0221415 x 10²³=7.708 x 10²² atoms
b. 0.0340 g of Zn
Number of moles = 0.0340g of Zn /65.38 g/mol =0.000520moles
Nmber of atoms =0.000520x 6.0221415 x 10²³=3.132 x 10²⁰atoms
c. 150 g of Ar
Number of moles = 150g of Ar /39.948 g/mol =3.7548moles
Nmber of atoms =3.7548molesx 6.0221415 x 10²³=2.261 x 10²⁴atoms
d. 0.124 g of Mg
Number of moles = 0.124g of Mg /24.305 g/mol =0.005moles
Number of atoms =0.005molesx 6.0221415 x 10²³=3.011 x 10²²atoms
Learn more about Number of atoms here:https://brainly.com/question/23626847
