Question

calculate the mass of 1 ) 0.5mole of n2 2) 0.5 mole of n 3)3.011 x 1023 no of n atoms.4) 6.022x 1023 no.of n2

Answer 1

a)number of mole = given mass/molar mass
0.5= gm/28
mass =0.5*28
=12
b) mass = number of moles *molar mass
0.5*42
21