The power gain is 49.3 dB.
The overall voltage gain is 43.2 dB.
Answer for S12.1
The capacitor should be 4.0 mF.
To get 5.0 V out with no load, an open-circuit gain of 44 dB would be required.
Notice, however, that the output impedance of the amplifier is 50 ohm. This suggests that a 50 ohm load may be added to the amplifier, such as a long coax cable properly terminated with 50 ohm; the open-circuit gain would then need to be doubled (50 dB) for 5.0 V to appear across the load.