Did Voldemort die because Harry had the elder wand?
No. The Elderwand was still in Voldermort's hand when he yelled the killing curse but the wand itself would not kill its true owner, Harry. The spell backfired and at that moment Harry blasted the wand from Voldermort's hand.
Until you are finished with the book, have someone else look at these questions for you. I am not trying to ruin it for you, or just ban them. That would be way more fun!
I'm ready to ban all Harry Potter book 7 questions.
Or I guess, just read faster. Sigh.