Question

Find the mass, in grams, of 1.00 x 1023 molecules of N2.

Answer 1

The mass of 1.00 ×10²³ molecules of N₂ is 4.76 g.

Step-by-step explanation:

Given data:

Number of molecules of N₂ = 1.00 ×10²³ molecules

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 example,

1 mole of N₂= 6.022 × 10²³ molecules of N₂

1.00 ×10²³ molecules of N₂ × 1 mole of N₂/6.022 × 10²³ molecules of N₂

0.17 moles of N₂

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.17 mol × 28 g/mol

Mass = 4.76 g

The mass of 1.00 ×10²³ molecules of N₂ is 4.76 g.