"Is the backpack in the hall her's" is the correct way to complete the sentence, since we are dealing with a possessive singular noun, which requires the apostrophe to go inside the "s".
The setting is both the time and place within a story. The setting helps initiate the main backdrop and the mood for a story.
In Fahrenheit 451 by Ray Bradbury Montag sees a fire after leaving the river that he describes as being warm, this is different from the burning fires that he has described earlier in the book. Though he is scared of the fire still, he approaches.
Antony keeps referring to Brutus as an "honest" man because he's being sarcastic. What he says and what he means are two completely different things. He's prodding at Brutus' guilt..... trying to get under his skin. The fact that Brutus really is honorable makes the sarcasm even more potent. None-the-less, the first time he attributes honor to Brutus, the audience is with him..... but by the time Antony's done, the audience is questioning that honor.. not applauding it.