Question

What is the mass of
(a) 1 mole N atom
(b) 4 mol Al atoms
(c) 10 mol of Na2S03
[At.Wt. of N=144,A1=27u,Na=23u,S=32u,0=164]​

Answer 1

Answer:

(a) 1 mole of nitrogen atoms=1×mass of N=1×14=14 g

(b) 4 moles of aluminium atoms=4×27=108 g

(c) 10 moles of sodium sulphite(Na

2

SO

3

)=10×Mass of Na

2

SO

3

.

Mass of Na

2

SO

3

=2×Mass of Na atom+1×Mass of S atom+3×Mass of O atom

=2×23+1×32+3×16=46+32+48=126 g/mol

∴10 moles of Na

2

SO

3

=10×126=1260 g