Question

calculate the mass of -

1}. 1 mole of nitrogen atoms {At.mass of nitrogen = 14u}

2]. 2 mole of aluminimum atoms [At.mass of al = 27u}.

Answer 1

1 mole of nitrogen atoms
molecular mass of nitrogen = 14g/mol
therefore, mass of 1mole of nitrogen atoms= 1mol $\times$14g/mol = 14g
2 moles of aluminium atoms
molecular mass of aluminium = 27g/mol
therefore, mass of 2 moles of aluminium atoms = 2 mol $\times$27g/mol = 54g