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

88 g

Explanation:

Given data:

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