Q 2.     Calculate the formula unit masses of ZnO, Na2O, K2CO3 , given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u

Answers (1)

Given, 

the atomic mass of Zn = 65 u,

the atomic mass of Na = 23 u,

the atomic mass of K = 39 u,

the atomic mass of C = 12 u,

and the atomic mass of O = 16 u

Now,

Formula unit mass of ZnO = Atomic mass of Zinc + Atomic mass of O

                                          =   65 u + 16 u

                                          =   81 u.

Formula unit mass of Na2O = 2 * Atomic mass of Na+ Atomic mass of O

                                          =    2 * 23 u + 16 u

                                          =    62 u.

Formula unit mass of K2CO3 = 2 * Atomic mass of K+ Atomic mass of C + 3 * Atomic mass of O

                                          =    2 * 39 u + 12 u + 3 * 16 u

                                          =    138 u.

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