Hi(g) decomposes to molecular hydrogen and molecular iodine by a
second-order reaction. if the initial pressure of hl is 0.691 atm and
the rate constant for the reaction is 0.100 atm-1.min-1, how much
time (min) will pass before the hi pressure drops to 0.187 atm?
enter your answer to 1 decimal place.

Explanation:

Second order decomposition (1 reactant) reaction means:

When temperature and volume are kept constant concentration is proportional to pressure (P) and the rate may be expressed in terms of pressure as:

Here you have:

Therefore, substituting:

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.