A chemist needs to find out how large of a container would be required to contain the products of an ammonia decomposition. If 8. 91 mol H2 are produced during the reaction, how many moles of N2 are produced? 2. 97 mol N2 26. 7 mol N2 8. 91 mol N2.

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.

it is reliable if two scientists recorded it