Question

What is the mass 5 mole molecules of nitrogen?
[molecular mass of nitrogen is 28g]

Answer 1

Answer:

Nitrogen molecule has 2 atoms.

Atomic number of Nitrogen is 7. Hence, Its molecular mass = 14 amu (7 protons and 7 neutrons.

1 mole of N2 gas contains Avogadro number of molecules: N = 6.022 * 10^23

mass of one molecule = 28 amu

mass of one mole of molecules of N2 = 28 gm/mol

mass of 0.5 mole of molecules of N2 at STP = 0.5 * 28 = 14 gm