What is the swivel range of the articulating arm on this TV wall mount?

The swivel range of the articulating arm on this TV wall mount is +90 degrees and -90 degrees.

What is the maximum weight capacity of the StarTech.com FPWARTB1M wall mount?

The maximum weight capacity of the StarTech.com FPWARTB1M wall mount is 77 lbs (35 kg).

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StarTech.com FPWARTB1M Full Motion TV Wall Mount - For 32" to 55" Monitors - Heavy Duty Steel - TV Mount with Articulating Arm - VESA Wall Mount

Free up space by mounting a flat-screen TV with this full-motion TV wall mount for VESA Mount TVs
Supports most 32-55" LED LCD flat panel TVs up to 77 lb (35kg)
Fits curved TVs with compatible VESA mount
Arm extension up to 19.8" (503 mm)
Arm tucks-in closely to the wall when not in use
TV mount with articulating arm swivels +90 / -90 degrees to provide maximum viewing flexibility
Tilts +2 /-12 degrees for easy angle adjustment
Flat-screen TV wall mount is made of heavy duty steel