One mole of which of these compounds contains two moles of hydrogen atoms? naoh h2s nh3 ch4

One mole of H₂S contains 2 atoms of hydrogen

Explanation:

In one mole of NaOH : 1 atom of Na and 1 atom of O and 1 atom of H

    one mole of H₂S   :  2 atoms of H and 1 atom of S

     one mole of NH₃  : 1 atom of N and 3 atoms of H

     One mole of CH₄ : 1 atom of C and 4 atoms of H

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.