A capacitor P with capacitance 10 × 10^–6 F is fully charged with a potential difference of 6.0 V and disconnected from the battery. The charged capacitor P is connected across another capacitor Q with capacitance 20 × 10^–6 F. The charge on capacitor Q when equilibrium is established will be α × 10^–5 C (assume capacitor Q does not have any charge initially), the value of α is _______ .