What are the masses of the four different brcl molecules?

Through mass spectrometry, we can define 4 different isotopes of the BrCl molecule:

⁸¹Br³⁷Cl, ⁸¹Br³⁵Cl, ⁷⁹Br³⁷Cl, ⁷⁹Br³⁵Cl  

Masses of the different individual isotopes:

³⁷Cl=36.966

³⁵Cl=34.968

⁸¹Br=80.916

⁷⁹Br=78.918

Masses of 4 different isotopes of the BrCl molecule:

⁸¹Br³⁷Cl=80.916+36.966=117.882

⁸¹Br³⁵Cl=80.916+34.968=115.884

⁷⁹Br³⁷Cl=78.918+36.966=115.884

⁷⁹Br³⁵Cl=78.918+34.968=113.886

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.