What is the dimension of impedance?

If an $8\,\Omega$ resistance and $6\,\Omega$ reactance are present in an $ac$ series circuit,then the impedance of the circuit will be......$\Omega$.

In a series $LCR$ circuit,resistance $R = 10 \Omega$ and the impedance $Z = 20 \Omega$. The phase difference between the current and the voltage is.......$^o$

The phase difference between current and voltage in an $AC$ circuit is $\pi/4$. If the frequency is $50\, Hz$,what is the time difference?

If a resistor of resistance $4 \Omega$,a capacitor of capacitive reactance $6 \Omega$ and an inductor of inductive reactance $9 \Omega$ are connected in series with an ac source,then the impedance of the circuit is (in $\Omega$)

Write the unit of $\omega C$.