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23>a)aluminium sulphate
      b)calcium chloride
      c)barium sulphate
      d)amonium chloride.

24> 49.7*79 + 50.3*81 /100 * 100
      =3926.3 + 4074.3 / 100 * 100
       =8000.6 / 1000
       =80.006 u
        =80 u (approx)

27> a) SO4  is the polyatomic ion.
MOLAR MASS(MgSO4) = 24+32+16*4
                                         =120 u

b)CO3 is the polyatomic ion.
MOLAR MASS(Na2CO3)=23*2+12+16*3
                                         =106 u

0 0 0
first tell me that molar mass unit is g per mole right so why are u writing u
yes but according to latest iupac u is the unit while calculating molar mass
now pls mark it brainlient ans
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