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

Answer:

Formula unit mass is defined as the sum of the atomic masses of all atoms that are present in a formula unit of the given compound.

  • Atomic mass of Zn = 65u
  • Atomic mass of Na = 23u
  • Atomic mass of K = 39u
  • Atomic mass of C = 12u
  • Atomic mass of O = 16u

Calculating the formula unit masses of the given compounds:

ZnO = Zn + O

ZnO =  (65 + 16)u = 81u

Na2O = 2Na + O

Na2O =  [(2 x 23)+16]u

Na2O = (46 + 16)u = 62u

K2CO3 = 2K + C + 3O

K2CO3 = [(2 x 39) + 12 + (3×16)]

K2CO3 = (78 + 12 + 48)u = 138u

Hence, the formula unit mass of ZnO is 81u, Na2O is 62u and K2CO3 is 138u.

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