Answer
$-1\times 10^6C$
Work Step by Step
We can find the required electric charge in carbon as
$Q=N(-e)$
$\implies Q=(6nN_A)(-e)$
We plug in the known values to obtain:
$Q=6(2)(6.022\times 10^{23})(-1.6\times 10^{-19})$
$Q=-1\times 10^6C$
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