Question

1. Calculate the molecular weights of the following substances :
(a) Aluminium hydroxide [Al(OH)3]
(b) Potassium dichromate [K,Cr,0]
(c) Ammonium nitrate [NH.NO3]
[O = 16; H = 1; Al = 27; K = 39; Cr = 52; N =
14]​

Answer 1

Answer:

a) Al(OH)3. ; 27+48+3

b) K2Cr2O7. ; 39+39+52+52+16(7)

c) NH.NO3. ; 14(2)+1+16(3)

Answer 2

Solution:-a) Al(OH)3=>27+(16+1)3=27+51=78g

b)K2Cr2O7=39×2+52×2+16×7=78+104+112=294g

c)NH4NO3=14+4+14+48=80g