Which of the following is an example of conservation of mass?
Amass before = 3g mass after = 3g
Bmass before = 4g mass after = 3g
Cmass before = 6g mass after = 12g
Amass before = 3g mass after = 3g
Bmass before = 4g mass after = 3g
Cmass before = 6g mass after = 12g