Question

Tentukan jumlah mol zat berikut :
A. 5 gram NaOH ( Ar.Na = 23, H = 1, O = 16 )
B. 1.2 gram Magnesium ( Ar.Mg = 24 )
C. 5.6 gram Besi ( Ar.Fe = 56 )

Answer 1

A. mol = massa/Mr = 5/40= 0,125 mol
Mr NaOH= (Ar Na )+(ArO)+(ArH) = 23+16+1=40
b. mol = 1.2/24 =0.05 mol
c. mol= 5.6/56=0.1 mol

semoga membantu

Answer 2

A. 0,125
n= gr/mr
= 5/(23+16+1)
= 5/40
= 0.125

B. 0,5
n= gr/Ar
n= 1,2/24
= 0,5

C. 0,1
n= gr/Ar
n= 5,6/56