Convert 1.3 x10^25 atoms of helium to grams of helium

88 g

Explanation:

Given dа ta:

Number of atoms of helium = 1.3*10²⁵

Mass in gram = ?

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 helium:

1 mol = 6.022 * 10²³ atoms of He

1.3*10²⁵ atoms of He * 1mol / 6.022 * 10²³ atoms of He

0.22*10² mol

22 mol

Mass in gram:

Mass = number of moles * molar mass

Mass = 22 mol * 4 g/mol

Mass = 88 g