Question

Calculate mass of 3.011 X 10 ²³no of nitrogen atoms ( atomic mass of N = 14 u)

Answer 1

Given number of nitrogen atoms = 3.011 X 10²³

Number of moles = Number of particles / Avogadro number

= 3.011 X 10²³ / 6.023*10²³

= 0.5 moles

So, Mass = moles * molar mass

= 0.5 * 14

= 7g

So, 7g is the mass of 3.011 X 10²³ number of nitrogen atoms.