la sala means "a room"
The family room.
La sala de clases means the classroom.
"La sala de clase" means "the classroom" in English. It refers to the physical space where students gather to learn from a teacher or instructor.
It means, "What is there in the class room?"
"Sala de estar". In Spain (I don't know in other hispanic countries) we say too commonly "Salón".
La sala de estar.
It means "the living room" (Sala de estar) or "the lounge", "waiting room" (sala de esperar).
If you mean sala, then it's room
"Estudiar en la sala" means "to study in the living room" in Spanish.
She/he is going to the room
It means, "...in the livingroom sometimes on the ironing board and never in the brandy."
Computer Room