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i know that connecting the capacitators in a colum, ΣC=(Ca*Cb)/(Ca+Cb)

also i know that

C=Q/V, which i think must be the equation i need since i am looking for Q, but i dont think the V i know is the right V, i think its the V for the whole system.

ΣC

_{1,2}=(C1*C2)/(C1+C2)=(8*4)/(8+4)=(8/3)μF

ΣC

_{1,2,3}=(C3*C

_{1,2})/(C3+C

_{1,2})=(8*(8/3))/(8+(8/3))=2μF

so now i know V

_{total}=12V and C

_{total}=2μF

C=Q/V

Q=C*V

Q

_{total}=2*12=24μC

but how do i find Q2 from the Q

_{total}