Final answer:
Edgar Allan Poe's choice of language in the provided text creates a melancholic mood, using words that evoke darkness, decay, and an overall feeling of gloom and despair.
Step-by-step explanation:
In Edgar Allan Poe's text, words like dull, dark, soundless, dreary, oppressive, melancholy, and phrases such as 'sickening of the heart' and 'vacant eye-like windows' are used to create a mood. These words and descriptions evoke a sense of despair and uneasiness. Poe's choice of language, focusing on darkness, decay, and desolation, effectively establishes a mood that is overwhelmingly melancholic, characterized by sadness and a gloomy atmosphere.