Question

how to calculate the number of electrons constituting one coulomb of charge

Answer 1

The charge on an electron is negative and it is -1.6 * 10^-19 coloumb, therefore, 1C charge is carried by 1/(-1.6 * 10^-19) = 6.25 * 10^18 electrons.
Hence, if 1A current flows through a conductor, it implies that 6.25 * 10^18 electrons pass per second across the cross-section of the conductor.

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Answer 2

Given that

Charge (Q) = 1 C

Electron (e) = 1.6× 10^-19

Number of electron (n) = ?

Q= ne

1 C = n × 1.6×10^-19 C

n = 1/(1.6×10^-19)

n = 6.25 × 10^18 electron