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Chemistry Question on Electrochemistry

The values of conductivity of some materials at 298.15K298.15 \, \text{K} in S m1\text{S m}^{-1} are:
2.1×103,1.0×1016,1.2×101,3.91,1.5×102,1×107,1.0×1032.1 \times 10^3, \, 1.0 \times 10^{-16}, \, 1.2 \times 10^1, \, 3.91, \, 1.5 \times 10^{-2}, \, 1 \times 10^{-7}, \, 1.0 \times 10^3.
The number of conductors among the materials is ______.

Answer

The materials can be categorized as conductors, insulators, and semiconductors based on their conductivity values at 298.15 K.

Conductors generally have conductivities on the order of 10210^2 to 106S m110^6 \, \text{S m}^{-1}.
Insulators have very low conductivities, typically around 101010^{-10} to 108S m110^{-8} \, \text{S m}^{-1}.
Semiconductors have conductivities ranging from 10410^{-4} to 10S m110 \, \text{S m}^{-1}.

Given values:

2.1×103,1.2×103,3.91,1.5×102,1×107,1.0×1032.1 \times 10^3, \, 1.2 \times 10^3, \, 3.91, \, 1.5 \times 10^{-2}, \, 1 \times 10^{-7}, \, 1.0 \times 10^3

Classifying each:

  • 2.1×103,1.2×103,and1.0×1032.1 \times 10^3, \, 1.2 \times 10^3, \, \text{and} \, 1.0 \times 10^3 are in the conductor range.
  • 3.913.91 also falls within the conductor range (upper range of semiconductors).
  • 1.5×1021.5 \times 10^{-2} represents a semiconductor.
  • 1×1071 \times 10^{-7} represents an insulator.

Therefore, the number of conductors is: 4.