Whose is a possessive pronoun that you should use when you're asking or telling whom something belongs to. Who's is a contraction made up of the words “who” and “is” or “who” and “has”
Mephistophilis describes hell, not as a place, but instead as a condition or one's state of being. A place where there is no God is considered as hell. To be deprived of eternal bliss is also hell. In essence, hell is the lack of the presence of God.