How many moles of atoms

7.98x 10^24 C2H2

25.8 grams of Co

Number of moles of C₂H₂ = 13.3 mol

Number of moles of Co = 0.92 mol

Explanation:

Given dа ta:

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