Rim is about 410g
Rear brake, no idea
Front brake is around 240g + about 140g for the rotor.
Cranks are about 590g including bash/sprocket
Stem is about 225g
Tyres are gonna be about 600-700g for front, and about 1.1-1.25kg for rear, plus tubes at about 150g each, and rim tape at about 50g for front and rear. If that front wheel is anything like my onza wheel it will be about 950g with the rotor. Your rear wheel will be about 900g-1kg too, not 500g! 500g is the weight of a decent rear rim!
EDIT: Weights off the top of my head