Question

find the mass in grams of 1.00 x 10 23 molecules of N2

Answer 1

Solution:

One mole of any substance contains 6.022×10²³ atoms/molecules.

Hence,

Moles of N₂ = 1 mol × (1.00×10²³ molecules / 6.022×10²³ molecules) = 0.166 mol N₂

Moles of N₂ = 0.166 mol

Moles of N₂ = Mass of N₂ / Molar mass of N₂

The molar mass of N₂ is 28.0134 g mol^-1.

Hence,

Mass of N₂ = Moles of N₂ × Molar mass of N₂

Mass of N₂ = 0.166 mol × 28.0134 g mol^-1 = 4.65 g

Mass of N₂ is 4.65 grams.

Answer: The mass of N₂ is 4.65 grams.