A chemist wants to determine the enthalpy of neutralization for the following reaction: HCI (aq) + NaOH(aq) → NaCl (aq) + H2O (1)
The chemist uses a coffee cup calorimeter to neutralize completely 61.1mL of 0.543 M HCI with
42.6 mL of NaOH. The initial temperature of both solutions is 17.8°C. After neutralization, the
highest recorded temperature is 21.6°C. Calculate the Heat neutralization in kJ/mol of HCl. Assume that
the density and specific heat capacity of both solutions is the same as that of water.

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.

answer carbon and three oxygen atoms;

im doing test rn im going with 2 but ill give answer if itss wrong,   : )