When a charged capacitor is connected to resistor, it discharges exponentially.
Charge on capacitor at any time t is given by,
[tex]Q = Q_{0}e^{ \frac{-t}{k} } [/tex]
k = RC = time constant = 35.9 x 77.9 x 10⁻³ = 2.79
plug t = 1.83 x k in above equation.
t = 5.1057 sec.
[tex]Q_{0} =[/tex] = CV = 77.9 x 10⁻³ x 9 = 0.7011 C.
plug values of [tex]Q_{0} =[/tex] and t in above equation to get Q
To calculate the charge after a long time, plug t= infinite in equation.