hitunglah mol dari 10 gram unsur Na dan 20 gram senyawa Na CL (jika Ar Na= 23g/mold an Ar CL = 35 gram /mol)?

Mol = gr/mr(ar)

Mol unsur Na
Mol = gr/ar
= 10/23
= 0,43 mol

Mol senyawa NaCl
Mol = gr/mr
= 20/58
= 0,34 mol

Mr NaCl :
= (1 x ar N) + (1 x ar Cl)
= (1 x 23) + (1 x 35)
= 23 + 35
= 58