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Calculating Conductivity in Compound Semiconductor

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Please explain to me how to solve part (b) of the following question

Suppose 2.490 kg of Ga are combined with 2.510 kg As to produce 5.000 kg GaAs. (a) Will this produce a p-type or an n-type semiconductor? (b) Calculate the number of extrinsic charge carriers per cubic cm using a lattice constant a0 = 0.563 nm. (c) Calculate the conductivity of this product in the saturation regime assuming the electron and hole mobilities in GaAs is 0.120 and 0.040 m2/Vs, respectively.

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The expert calculates the conductivity in a compound semiconductor.

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Problem: Suppose 2.490 kg of Ga are combined with 2.510 kg As to produce 5.000 kg GaAs. (a) Will this produce a p-type or an n-type semiconductor? (b) Calculate the number of extrinsic charge carriers per ...

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