Answer:
Mass = 10440.9 g
Explanation:
Given data:
Number of atoms of Cu₂S = 3.95×10²⁵
Grams of Cu₂S = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Now we calculate the number of moles from given number of atoms.
3.95×10²⁵ atoms/ 6.022 × 10²³ atoms × 1 mol
0.656×10² mol
65.6 mol
Now we will calculate the mass:
Mass = number of moles × molar mass
Mass = 65.6 mol × 159.16 g/mol
Mass = 10440.9 g
