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Question

How do you determine the formula and molar mass of Silver Cyanide?


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Solution

Chemical Formula:

  1. A substance's chemical formula is a symbolic representation of its chemical constituents. It defines the ratios in which their atoms combine to form molecules.
  2. The electronic configuration of Silver is1s22s22p63s23p64s23d104p64d105s1. It will form a stable d-orbital configuration after removing one electron from its s-orbital.
  3. The valency of an element is defined as the combining capacity of the element to form compounds with another, since silver loses one electron to form a stable configuration, its valency is +1.
  4. Cyanide ion has a charge of -1 according to the lewis structure hence, it has a valency of -1.
  5. For writing the molecular formula, we will use the criss-cross method i.e. exchange the valencies of ions, we get Ag1CN1 or simply AgCN.
  6. Hence, the formula for silver cyanide is AgCN.

Molar mass:

  1. It is the sum of the atomic mass of all the atoms in the molecule.
  2. The atomic mass of silver=107.87u, the atomic mass of carbon=12.01u, and the atomic mass of nitrogen=14.01u
  3. The molar mass of silver cyanide= Atomic mass of silver +Atomic mass of carbon +atomic mass of nitrogen107.87+12.01+14.01
  4. The molar mass of silver cyanide =133.89gmol-1

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