Calculate the mass of 4.5×10^ 8 molecules of nitrogen

Question

Calculate the mass of nitrogen molecules give the molar number

Answer 1

Since the question refers to nitrogen MOLECULES, this would be N₂ and not N, as N would be referred to as atoms.

Having established that, you can convert molecules to moles and then moles to mass (grams).

4.5x10⁸ molecules N₂ x 1 mole N₂/6.02x10²³ molecules = 7.48x10^-16 moles of N₂

7.48x10^-16 moles N₂ x 28 g/mole = 2.09x10^-14 grams