Answer:
Number of moles of C₂H₂ = 13.3 mol
Number of moles of Co = 0.92 mol
Step-by-step explanation:
Given data:
Number of molecules of C₂H₂ = 7.98 ×10²⁴
Number of moles of C₂H₂ = ?
Mass of Co = 25.8 g
Number of moles of Co = ?
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 C₂H₂:
1 mol = 6.022 × 10²³ molecules
7.98 ×10²⁴ molecules × 1 mol / 6.022 × 10²³ molecules
1.33×10¹ mol
13.3 mol
For Co:
Number of moles = mass/ molar mass
Number of moles = 25.8 g/ 28 g/mol
Number of moles = 0.92 mol