In what chapter of Harry Potter and the Deathly Hallows does Bellatrix Lestrange die?

Answer 1

Remus was one of the many Order members who answered Neville Longbottom's call to arms on May 2, 1998, when Harry, Hermione and Ron returned to Hogwarts and Lord Voldemort gathered his army to attack the school. He organised and led groups to fight Death Eaters on the school grounds along with Kingsley Shacklebolt and Arthur Weasley. His wife initially agreed not to participate in the Battle of Hogwarts, instead staying with their infant son, but was unable to bear leaving her husband to face such danger without her. She left Teddy with her mother and raced to Hogwarts, where she was informed that Remus was last seen fiercely and courageously dueling Death Eater Antonin Dolohov. Dolohov killed Remus, and Tonks was murdered by her aunt Bellatrix Lestrange around the same time. During the brief pause in the battle, Remus and Tonks' bodies were laid out beside each other in the Great Hall. The nature of Remus's death was not revealed, but his body was peaceful-looking, implying that he was struck with a Killing Curse or Dolohov's own curse; both are known to leave no visible marks on the outer body. When Harry proceeded to the Death Eater camp to be struck down by Voldemort, he first activated the Resurrection Stone, bringing back the souls of his parents, Sirius, and Remus, the latter of which expressed the hope that Harry would care for his son, lamenting that he would never know him.

Answer 2

We do not actually see Lupin die, but we discover the fact of his death in the beginning of Chapter 33, "The Prince's Tale".

Answer 3

chapter 36,

the flaw in the plan