Goc + mole concept

Dear student,

Question no. 2
Eq. Mass = 32
Valency of Metal = 2 (because it is bivalent)
Therefore, Atomic Mass = Equivalent Mass x Valency 
                                       = (32 x 2) = 64

Now, Molar Mass of M(NO3)2 = Molar Mass of [M + 2(N) + 2(3O)] = [64 + (2 x 14) + (2 x 3 x 16)]
                                                 = 64 + 28 + 96 = 188
Question no. 4


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